Python: Swap two variables
Python Basic: Exercise-91 with Solution
Write a Python program to swap two variables.
Python: swapping two variables
Swapping two variables refers to mutually exchanging the values of the variables. Generally, this is done with the data in memory.
The simplest method to swap two variables is to use a third temporary variable :
define swap(a, b) temp := a a := b b := temp
Sample Solution-1:
Python Code:
a = 30
b = 20
print("\nBefore swap a = %d and b = %d" %(a, b))
a, b = b, a
print("\nAfter swaping a = %d and b = %d" %(a, b))
print()
Sample Output:
Before swap a = 30 and b = 20 After swaping a = 20 and b = 30
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-2:
Python Code:
x = 34
y = 56
print("Initial Value of x =", x)
print("Initial Value of y =", y)
temp = x
x = y
y = temp
print("\nAfter swaping value of x =", x)
print("After swaping value of y =", y)
Sample Output:
Initial Value of x = 34 Initial Value of y = 56 After swaping value of x = 56 After swaping value of y = 34
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
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
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