Definition, use and output of variables in python
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1. Define variable
Enter:
# Filename: var.py
I = 5
Print (I)
I = I + 1
Print (I)
S =''This is a multi-line string. This is the second line.'''
Print (s)
Output:
five
six
This is a multi-line string.
This is the second line.
Explanation:
It is preceded by the name of the variable, the code name of a number or a paragraph of characters.
Assignment assigns the latter to the preceding variable through the "=".
(order before and after)
two。 Abbreviation of variable operation
Enter:
A = 2; a * = 3
A = 2; a = a * 3
Output:
six
six
Explanation:
A shorthand method when the same variable appears on both sides of the equal sign.
A=a+3 is equivalent to axiomatic 3.
3. Variable operation output
Enter:
#! / usr/bin/python # Filename: expression.py
Length = 5
Breadth = 2
Area = length * breadth
Print ('Area is', area)
Print ('Perimeter is', 2 * (length + breadth))
Output:
Area is 10
Perimeter is 14
Explanation:
Assign the value first, and then calculate it.
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