Python package installs globally but fails within virtual environment

Question

I am new to Python and struggling to understand the different ways to install packages. I am on MacOS Catalina.

I tried installing the Python package CytoPy (https://github.com/burtonrj/CytoPy) in the terminal:

pip install cytopy

This installs fine. I create a file test.py:

from cytopy.data.setup import global_init
print("test")

Which runs fine, i.e. the cytopy package is imported correctly.

I then follow this Getting Started with Python in Visual Studio tutorial here: https://code.visualstudio.com/docs/python/python-tutorial

It says its important to avoid installing packages into a global interpreter environment and instead use a project-specific virtual environment. I create a virtual environment as per the tutorial in the Terminal within Visual Studio Code:

python3 -m venv .venv
source .venv/bin/activate

Now, I attempt to install the package in the virtual environment:

pip install cytopy

And I end up with a huge number of errors:

The main error is:

 ERROR: Failed building wheel for fdasrsf
 Successfully built hdbscan
 Failed to build fdasrsf
 ERROR: Could not build wheels for fdasrsf, which is required to install 
 pyproject.toml-based projects

Why does it install globally, but not within the virtual environment via the terminal in Visual Studio Code?

EDIT I used pip3 as suggested. I still get the same error. Here are more logs of the errors:

                                          _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:83:53: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     pthread_sigmask(int, const sigset_t *, sigset_t *) __DARWIN_ALIAS(pthread_sigmask);
                                                        ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:83:53: note: insert '_Nullable' if the pointer may be null
int     pthread_sigmask(int, const sigset_t *, sigset_t *) __DARWIN_ALIAS(pthread_sigmask);
                                                        ^
                                                         _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:83:53: note: insert '_Nonnull' if the pointer should never be null
int     pthread_sigmask(int, const sigset_t *, sigset_t *) __DARWIN_ALIAS(pthread_sigmask);
                                                        ^
                                                         _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:84:43: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigaction(int, const struct sigaction * __restrict,
                                              ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:84:43: note: insert '_Nullable' if the pointer may be null
int     sigaction(int, const struct sigaction * __restrict,
                                              ^
                                                _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:84:43: note: insert '_Nonnull' if the pointer should never be null
int     sigaction(int, const struct sigaction * __restrict,
                                              ^
                                                _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:85:23: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
            struct sigaction * __restrict);
                             ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:85:23: note: insert '_Nullable' if the pointer may be null
            struct sigaction * __restrict);
                             ^
                               _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:85:23: note: insert '_Nonnull' if the pointer should never be null
            struct sigaction * __restrict);
                             ^
                               _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:86:24: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigaddset(sigset_t *, int);
                           ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:86:24: note: insert '_Nullable' if the pointer may be null
int     sigaddset(sigset_t *, int);
                           ^
                            _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:86:24: note: insert '_Nonnull' if the pointer should never be null
int     sigaddset(sigset_t *, int);
                           ^
                            _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:31: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:31: note: insert '_Nullable' if the pointer may be null
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                  ^
                                    _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:31: note: insert '_Nonnull' if the pointer should never be null
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                  ^
                                    _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:53: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                                        ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:53: note: insert '_Nullable' if the pointer may be null
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                                        ^
                                                          _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:87:53: note: insert '_Nonnull' if the pointer should never be null
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                                        ^
                                                          _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:88:24: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigdelset(sigset_t *, int);
                           ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:88:24: note: insert '_Nullable' if the pointer may be null
int     sigdelset(sigset_t *, int);
                           ^
                            _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:88:24: note: insert '_Nonnull' if the pointer should never be null
int     sigdelset(sigset_t *, int);
                           ^
                            _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:89:26: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigemptyset(sigset_t *);
                             ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:89:26: note: insert '_Nullable' if the pointer may be null
int     sigemptyset(sigset_t *);
                             ^
                              _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:89:26: note: insert '_Nonnull' if the pointer should never be null
int     sigemptyset(sigset_t *);
                             ^
                              _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:90:25: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigfillset(sigset_t *);
                            ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:90:25: note: insert '_Nullable' if the pointer may be null
int     sigfillset(sigset_t *);
                            ^
                             _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:90:25: note: insert '_Nonnull' if the pointer should never be null
int     sigfillset(sigset_t *);
                            ^
                             _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:94:32: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigismember(const sigset_t *, int);
                                   ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:94:32: note: insert '_Nullable' if the pointer may be null
int     sigismember(const sigset_t *, int);
                                   ^
                                    _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:94:32: note: insert '_Nonnull' if the pointer should never be null
int     sigismember(const sigset_t *, int);
                                   ^
                                    _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:96:25: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigpending(sigset_t *);
                            ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:96:25: note: insert '_Nullable' if the pointer may be null
int     sigpending(sigset_t *);
                            ^
                             _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:96:25: note: insert '_Nonnull' if the pointer should never be null
int     sigpending(sigset_t *);
                            ^
                             _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:37: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                        ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:37: note: insert '_Nullable' if the pointer may be null
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                        ^
                                          _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:37: note: insert '_Nonnull' if the pointer should never be null
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                        ^
                                          _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:60: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                                               ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:60: note: insert '_Nullable' if the pointer may be null
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                                               ^
                                                                 _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:97:60: note: insert '_Nonnull' if the pointer should never be null
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                                               ^
                                                                 _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:100:31: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigsuspend(const sigset_t *) __DARWIN_ALIAS_C(sigsuspend);
                                  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:100:31: note: insert '_Nullable' if the pointer may be null
int     sigsuspend(const sigset_t *) __DARWIN_ALIAS_C(sigsuspend);
                                  ^
                                   _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:100:31: note: insert '_Nonnull' if the pointer should never be null
int     sigsuspend(const sigset_t *) __DARWIN_ALIAS_C(sigsuspend);
                                  ^
                                   _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:28: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                               ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:28: note: insert '_Nullable' if the pointer may be null
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                               ^
                                 _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:28: note: insert '_Nonnull' if the pointer should never be null
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                               ^
                                 _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:46: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                                                 ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:46: note: insert '_Nullable' if the pointer may be null
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                                                 ^
                                                   _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:101:46: note: insert '_Nonnull' if the pointer should never be null
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                                                 ^
                                                   _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:103:39: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
void    psignal(unsigned int, const char *);
                                         ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:103:39: note: insert '_Nullable' if the pointer may be null
void    psignal(unsigned int, const char *);
                                         ^
                                          _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:103:39: note: insert '_Nonnull' if the pointer should never be null
void    psignal(unsigned int, const char *);
                                         ^
                                          _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:31: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigvec(int, struct sigvec *, struct sigvec *);
                                  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:31: note: insert '_Nullable' if the pointer may be null
int     sigvec(int, struct sigvec *, struct sigvec *);
                                  ^
                                   _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:31: note: insert '_Nonnull' if the pointer should never be null
int     sigvec(int, struct sigvec *, struct sigvec *);
                                  ^
                                   _Nonnull
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:48: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int     sigvec(int, struct sigvec *, struct sigvec *);
                                                   ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:48: note: insert '_Nullable' if the pointer may be null
int     sigvec(int, struct sigvec *, struct sigvec *);
                                                   ^
                                                    _Nullable
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/signal.h:106:48: note: insert '_Nonnull' if the pointer should never be null
int     sigvec(int, struct sigvec *, struct sigvec *);
                                                   ^
                                                    _Nonnull
220 warnings generated.
clang -bundle -undefined dynamic_lookup -L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/markkelly/.pyenv/versions/3.8.0/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/markkelly/.pyenv/versions/3.8.0/lib build/temp.macosx-10.15-x86_64-3.8/src/DP.o build/temp.macosx-10.15-x86_64-3.8/src/optimum_reparam_N.o -o build/lib.macosx-10.15-x86_64-3.8/optimum_reparam_N.cpython-38-darwin.so
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/private/var/folders/pg/g0n4w9955m7ff1rsj6b6tpz40000gn/T/pip-build-env-vgswf17a/overlay/lib/python3.8/site-packages/numpy/core/include -I/Users/markkelly/RedMatter/repos/new_version/cytopy/.venv/include -I/Users/markkelly/.pyenv/versions/3.8.0/include/python3.8 -c src/bayesian.cpp -o build/temp.macosx-10.15-x86_64-3.8/src/bayesian.o
In file included from src/bayesian.cpp:1:
In file included from src/armadillo:26:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:317:9: error: no member named 'signbit' in the global namespace
using ::signbit;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:318:9: error: no member named 'fpclassify' in the global namespace
using ::fpclassify;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:319:9: error: no member named 'isfinite' in the global namespace; did you mean 'finite'?
using ::isfinite;
      ~~^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/math.h:752:12: note: 'finite' declared here
extern int finite(double)
           ^
In file included from src/bayesian.cpp:1:
In file included from src/armadillo:26:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:320:9: error: no member named 'isinf' in the global namespace
using ::isinf;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:321:9: error: no member named 'isnan' in the global namespace
using ::isnan;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:322:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:323:9: error: no member named 'isgreater' in the global namespace
using ::isgreater;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:324:9: error: no member named 'isgreaterequal' in the global namespace
using ::isgreaterequal;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:325:9: error: no member named 'isless' in the global namespace
using ::isless;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:326:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:327:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:328:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:329:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:640:26: error: no template named 'numeric_limits'
    bool _FloatBigger = (numeric_limits<_FloatT>::digits > numeric_limits<_IntT>::digits),
                         ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:640:60: error: no template named 'numeric_limits'
    bool _FloatBigger = (numeric_limits<_FloatT>::digits > numeric_limits<_IntT>::digits),
                                                           ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:641:18: error: no template named 'numeric_limits'
    int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
                 ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:641:50: error: no template named 'numeric_limits'
    int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
                                                 ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:646:17: error: no template named 'numeric_limits'
  static_assert(numeric_limits<_FloatT>::radix == 2, "FloatT has incorrect radix");
                ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:649:25: error: no template named 'numeric_limits'
  return _FloatBigger ? numeric_limits<_IntT>::max() :  (numeric_limits<_IntT>::max() >> _Bits << _Bits);
                        ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
setup.py:47: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
  mac_ver = str(LooseVersion(get_config_var('MACOSX_DEPLOYMENT_TARGET')))
not modified: 'build/_DP.c'

It seems to be something to do with CommandLineTools

EDIT

To follow on from a comment below by Alan, when I go to Visual Studio Code > Command Palette > Python: Select Interpreter, I see this:

EDIT Following @Phoenix answer, I downloaded and installed conda. I then created a virtual environment:

conda create --name myEnv python=3.8

I then activate:

conda activate myEnv

It activates as I see (myEnv). I then do:

which python

Which outputs:

/usr/local/bin/python

I then do (within myEnv):

python --version

Which outputs:

Python 3.9.9

When I should expect 3.8.0. Anyway, I proceed and run (within myEnv):

pip install numpy==1.19 

Which responds with yet another error:

ERROR: Could not find a version that satisfies the requirement numpy==1.19 (from versions: 1.3.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.10.0.post2, 1.10.1, 1.10.2, 1.10.4, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.12.0, 1.12.1, 1.13.0rc1, 1.13.0rc2, 1.13.0, 1.13.1, 1.13.3, 1.14.0rc1, 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6, 1.15.0rc1, 1.15.0rc2, 1.15.0, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0rc1, 1.16.0rc2, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.16.6)

Of course, numpy 1.19 does exist.

It is always this extraordinarily hard to set up a virtual environment with python?

Answer 1

I think the library you are trying to use is supported on python3.6 and python3.7. I think your default global python version is 2.7, but your venv was created with python3.8, hence error.

Try creating venv with one of 2.7, 3.6 or 3.7 python and try again.

I found that: python<version optionally> -m pip install <sth> always uses proper pip and saves me a lot of head scratching and hair pulling.