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Python: hash() function

hash() function

The hash() function returns the hash value of the object (if it has one).

Hash values are integers. They are used to quickly compare dictionary keys during a dictionary lookup. Numeric values that compare equal have the same hash value (even if they are of different types, as is the case for 1 and 1.0).

Version:

(Python 3.2.5)

Syntax:

hash(object)

Parameter:

Name Description Required /
Optional
object An object. Required.

Example: Python hash() function

# hash for integer unchanged
print('Hash for 252 is:', hash(252))

# hash for decimal
print('Hash for 252.25 is:',hash(252.25))

# hash for string
print('Hash for Python is:', hash('Python Example'))

Output:

Hash for 252 is: 252
Hash for 252.25 is: 576460752303423740
Hash for Python is: 4427590093227766552

Python Code Editor:

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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