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Whenever I try to use any of the built-in functions of Python's exponentiation and logarithms module, I get an error like this:
NameError: name 'sqrt' is not defined I have tried using math.sqrt(4),sqrt(4) and sqrt(4.0), but none of them work. The exception is pow, which works as it's supposed to. This is really strange and I'm not sure what's wrong.
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What is math module in Python? The math module is a standard module in Python and is always available. To use mathematical functions under this module, you have to import the module using import math . It gives access to the underlying C library functions.
As I mentioned earlier, the math module comes packaged with the standard Python installation. So, it is a built-in Python module, and to use it you just need to import it. Printing the type() of math will tell you that it is a module. dir() will give you all available attributes and methods available in math .
These modules are not written in Python but in C. You can find them (at least on linux) in a subfolder of the lib-folder called lib-dynload. The math module is then in a file math.cpython-33m.so (on windows probably with .
Python has a built-in module that you can use for mathematical tasks. The math module has a set of methods and constants.
pow is built into the language(not part of the math library). The problem is that you haven't imported math.
Try this:
import math math.sqrt(4) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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