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In Python, we can simply use the bin() function to convert from a decimal value to its corresponding binary value. The bin() takes a value as its argument and returns a binary equivalent. Note: bin() return binary value with the prefix 0b, so depending on the use-case, formatting should be done to remove 0b.
Use bin() Function to Convert Int to Binary in Python In Python, you can use a built-in function, bin() to convert an integer to binary. The bin() function takes an integer as its parameter and returns its equivalent binary string prefixed with 0b .
all numbers are stored in binary. if you want a textual representation of a given number in binary, use bin(i)
>>> bin(10)
'0b1010'
>>> 0b1010
10
"{0:#b}".format(my_int)
Without the 0b in front:
"{0:b}".format(int_value)
Starting with Python 3.6 you can also use formatted string literal or f-string, --- PEP:
f"{int_value:b}"
def dec_to_bin(x):
return int(bin(x)[2:])
It's that easy.
You can also use a function from the numpy module
from numpy import binary_repr
which can also handle leading zeros:
Definition: binary_repr(num, width=None)
Docstring:
Return the binary representation of the input number as a string.
This is equivalent to using base_repr with base 2, but about 25x
faster.
For negative numbers, if width is not given, a - sign is added to the
front. If width is given, the two's complement of the number is
returned, with respect to that width.
I agree with @aaronasterling's answer. However, if you want a non-binary string that you can cast into an int, then you can use the canonical algorithm:
def decToBin(n):
if n==0: return ''
else:
return decToBin(n/2) + str(n%2)
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