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6 LOOPING IN PYTHON
Chapter Outline
6.1 Need for Repeated Execution of Statements 6.2 range()
6.3 for Statement 6.4 while Statement
6.5 Jump Statements 6.6 Nested Loops
6.7 Printing Patterns 6.8 Infinite Loop
6.9 pass Statement
Introduction
In our day-to-day lives, many tasks are performed repeatedly. For example, food is prepared three times a day, plants
are watered daily, and bills are paid monthly. Similarly, in a program, parts of code are often required to be executed
repeatedly. For example, we may be required to compute the percentage of marks for each student in a class or compute
total wages for each employee in the company. Computers can be programmed to execute such tasks repeatedly. The
repeated execution of statements in a program is called iteration, or loop. Python provides for and while statements
to perform repeated execution of statements.
6.1 Need for Repeated Execution of Statements
Let's say we want to find out what the average marks were for a group of 10 students. From what we've learned so far,
we know that the task can be easily done by Program 6.1
Program 6.1 Computation of average marks of a group of 10 students in an examination
01 '''
02 objective: To find the average marks of a group of 10 students
03 in an examination.
04 Inputs: Accept data interactively
05 Output: Average marks
06 '''
07 sumMarks = 0
08 nStudents = 10
09 marks = int(input('Enter marks: '))
10 sumMarks = sumMarks + marks
11 marks = int(input('Enter marks: '))
12 sumMarks = sumMarks + marks
13 marks = int(input('Enter marks: '))
14 sumMarks = sumMarks + marks
15 marks = int(input('Enter marks: '))
Looping in Python 127

