Python: bin() function
bin() function
The bin() function is used to convert an integer number to a binary string. The result is a valid Python expression.
Syntax:
bin(x)
Version:
(Python 3.2.5)
Note: If x is not a Python int object, it has to define an __index__() method that returns an integer.
Return value:
integer.
Example: Python bin() function - Convert integer to binary
x = 10
print("Original number: ",x)
y = bin(x)
print("Binary string:")
print (y)
x = -10
print("\nOriginal number: ",x)
y = bin(x)
print("Binary string:")
print (y)
Output:
Original number: 10 Binary string: 0b1010 Original number: -10 Binary string: -0b1010
Example: Python bin() function - Convert integer to binary without sign prefix
x = 10
print("Original number: ",x)
print(x)
print("Binary string:")
print(bin(x)[2:].zfill(8))
x = -10
print("\nOriginal number: ",x)
print(x)
print("Binary string:")
print(bin(x)[3:].zfill(8))
Output:
Original number: 10 10 Binary string: 00001010 Original number: -10 -10 Binary string: 00001010
Example: Convert an integer to binary without using bin() function
def dec_to_bin(n):
binary = ""
x = 0
while n > 0 and x<=8:
s1 = str(int(n%2))
binary = binary + s1
n /= 2
x = x + 1
result = binary[::-1]
return result
print(dec_to_bin(10))
print(dec_to_bin(8))
print(dec_to_bin(110))
Output:
000001010 000001000 001101110
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Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
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