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Python: hex() function

hex() function

The hex() function converts an integer number to a lowercase hexadecimal string prefixed with "0x".

Version:

(Python 3.2.5)

Syntax:

hex(x)

Parameter:

Name Description Required /
Optional
x An integer number Required

Example: Python hex() function 

number = 127
print(number, 'in hex =', hex(number))

number = 0
print(number, 'in hex =', hex(number))

number = -35
print(number, 'in hex =', hex(number))

returnType = type(hex(number))
print('Return type from hex() is', returnType)

Output:

127 in hex = 0x7f
0 in hex = 0x0
-35 in hex = -0x23
Return type from hex() is <class 'str'>

Example: hex() function, representation of a float

number = 5.25
print(number, 'in hex =', float.hex(number))

number = 0.0
print(number, 'in hex =', float.hex(number))

number = 15.5
print(number, 'in hex =', float.hex(number))

Output:

5.25 in hex = 0x1.5000000000000p+2
0.0 in hex = 0x0.0p+0
15.5 in hex = 0x1.f000000000000p+3

Pictorial Presentation:

Python: Built-in-function - hex() function

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

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")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m