Use for Loop That Loops Over a Sequence in Python (original) (raw)

Last Updated : 11 Sep, 2025

Using for loop we can iterate a sequence of elements over an iterable like a tuple, list, dictionary, set, String, etc. A sequence consists of multiple items and this item can be iterated using in keyword and range keyword in for loop.

**Example 1: Python For Loop using List

A list is used to store the multiple values of the different types under a single variable. It is mutable i.e., items in the list can be changed after creation. The list is created by enclosing the data items with square brackets.

Python `

list creation

a = ["Geeks", "for", "Geeks"]

for i in a: print(i) print('-----') for i in range(len(a)): print(a[i])

Output

Geeks for Geeks

**Example 2: Python For Loop using Tuple

A tuple is used to store the multiple values of the different types under a single variable. It is immutable i.e., items in a tuple cannot be changed after creation. A tuple is created by enclosing the data items with round brackets.

Python `

tuple creation

tup = ("Geeks", "for", "Geeks", "GFG", "Learning", "Portal")

for i in tup: print(i) print('-----') for i in range(3, len(tup)): print(tup[i])

Output

Geeks for Geeks GFG Learning Portal

GFG Learning Portal

**Example 3: Python For Loop using Dictionary

Dictionary is an unordered collection of items where data is stored in key-value pairs. Unlike other data types like list, set and tuple it holds data as key: value pair. for loop uses in keyword to iterate over each value in a dictionary.

Python `

dictionary creation

d = {1: "a", 2: "b", 3: "c", 4: "d"}

for i in d: print(i)

**Example 4: Python For Loop using Set

A set is an unordered, unindexed, and immutable datatype that holds multiple values under a single variable. It can be created by surrounding the data items around flower braces or a set method. As the set is unindexed range method is not used.

Python `

set creation

set1 = {"unordered", "unindexed", "immutable"}

for i in set1: print(i)

Output

unordered unindexed immutable

**Example 5: Python For Loop using String

Here we passed the step variable as **2 in the range method. So we got alternate characters in a string.

Python `

string creation

str = "GFG Learning-Portal"

for i in str: print(i, end="")

print() for i in range(0, len(str), 2): print(str[i], end="_")

Output

GFG Learning-Portal G_G_L_a_n_n_-o_t_l