Python for in loop

Python for-in loop is used to iterate over a sequence of numbers, a string, a list, a tuple, or a dictionary.

for val in sequence:
    loop body

Python for in loop

Simple example code where for loop does not require an indexing variable to set beforehand. Let’s write the Program to find the sum of all numbers stored in a list.

# List of numbers
numbers = [1, 2, 3, 8, 4, 2, 5, 4]
sum = 0

# iterate over the list
for val in numbers:
    sum = sum + val

print("The sum is", sum)

Output:

More examples

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)

Looping Through a String

for x in "Hello":
  print(x)

With the break statement, you can stop the loop before it has looped through all the items:

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)
  if x == "banana":
    break

Comment if you have any doubts or suggestions on this Python loop topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

Python for in loop