Python: pow() function
pow() function
The pow() function is used to get the value of x to the power of y (xy). If z is present, return x to the power y, modulo z (computed more efficiently than pow(x, y) % z).
Version:
(Python 3.2.5)
Syntax:
pow(x, y[, z])
Parameter:
Name | Description | Required / Optional |
---|---|---|
x | A number (the base) which is to be powered. | Required |
y | A number (the exponent) which is to be powered with x. | Required |
z | A number which is to be used for modulus operation. | Optional |
Example: Python pow() function
# positive a, positive b (a**b)
print(pow(4, 4))
# negative a, positive b
print(pow(-4, 4))
# positive a, negative b (a**-b)
print(pow(4, -4))
# negative a, negative b
print(pow(-4, -4))
Output:
256 256 0.00390625 0.00390625
Pictorial Presentation:
Example: Python pow() with three arguments (x**y) % z
a = 3
b = 5
c = 7
print(pow(a, b, c))
Output:
5
Python Code Editor:
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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
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