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PythonFor Loops are used for iterating over a sequence like lists, tuples, strings, and ranges.

• For loop allows you to apply the same operation to every item within loop.
• Using For Loop avoid the need of manually managing the index.
• For loop can iterate over any iterable object, such as dictionary, list or any custom iterators.

For Loop Example:

s=["Geeks","for","Geeks"]# using for loop with stringforiins:print(i)

GeeksforGeeks

Flowchart of Python For Loop

Python For Loop Syntax

for var in iterable:

# statements

pass

Note:In Python, for loopsonlyimplement thecollection-based iteration.

Python For Loop with String

This code uses a for loop to iterate over astring and print each character on a new line. The loop assigns each character to the variable i and continues until all characters in the string have been processed.

s="Geeks"foriins:print(i)

Geeks

Using range() with For Loop

Therange() function is commonly used with for loops to generate a sequence of numbers. It can take one, two, or three arguments:

• range(stop): Generates numbers from 0 to stop-1.
• range(start, stop): Generates numbers from start to stop-1.
• range(start, stop, step):Generates numbers from start to stop-1, incrementing by step.

foriinrange(0,10,2):print(i)

02468

Control Statements with For Loop

Loop control statements change execution from their normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed. Python supports the following control statements.

Continue with For Loop

Pythoncontinue Statement returns the control to the beginning of the loop.

# Prints all letters except 'e' and 's'foriin'geeksforgeeks':ifi=='e'ori=='s':continueprint(i)

gkforgk

Break with For Loop

Pythonbreak statement brings control out of the loop.

foriin'geeksforgeeks':# break the loop as soon it sees 'e'# or 's'ifi=='e'ori=='s':breakprint(i)

e

Pass Statement with For Loop

Thepass statement to write empty loops. Pass is also used for empty control statements, functions, and classes.

# An empty loopforiin'geeksforgeeks':passprint(i)

s

Else Statement with For Loops

Python also allows us to use theelse condition for loops. The else block just after for/while is executed only when the loop is NOT terminated by a break statement.

foriinrange(1,4):print(i)else:# Executed because no break in forprint("No Break\n")

123No Break

Using Enumerate with for loop

In Python,enumerate() function is used with the for loop to iterate over an iterable while also keeping track of index of each item.

li=["eat","sleep","repeat"]fori,jinenumerate(li):print(i,j)

0 eat1 sleep2 repeat

Nested For Loops in Python

This code uses nested for loops to iterate over two ranges of numbers (1 to 3 inclusive) and prints the value of i and j for each combination of these two loops. \

The inner loop is executed for each value of i in outer loop. The output of this code will print the numbers from 1 to 3 three times, as each value of i is combined with each value of j.

foriinrange(1,4):forjinrange(1,4):print(i,j)

1 11 21 32 12 22 33 13 23 3

Python For LoopExercise Questions

Below are two Exercise Questions on Python for-loops. We have covered continue statement and range() function in these exercise questions.

Q1.Code to implement Continue statement in for-loop

a=["shirt","sock","pants","sock","towel"]b=[]foriina:ifi=="sock":continueelse:print(f"Washing{i}")b.append("socks")print(f"Washing{b}")

Washing shirtWashing pantsWashing towelWashing ['socks']

Q2.Code to implement range function in for-loop

foriinrange(1,8):d=3+(i-1)*0.5print(f"Day{i}: Run{d:.1f} miles")

Day 1: Run 3.0 milesDay 2: Run 3.5 milesDay 3: Run 4.0 milesDay 4: Run 4.5 milesDay 5: Run 5.0 milesDay 6: Run 5.5 milesDay 7: Run 6.0 miles

Test Your Knowledge -Python For Loop Quiz

For loops in Python

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