How to use a for loop in Python?

2 years ago
William Carter
1 minute

In Python, you can use a for loop to iterate through the elements of an iterable object (such as a list, tuple, string, etc.). The basic syntax of a for loop is as follows:

for 变量 in 可迭代对象:
    # 执行的代码块

In this case, the variable is a temporary variable used to store the value of each element in every iteration. The iterable object is an object containing multiple elements.

Here are some common examples of using a for loop:

  1. Iterating through the elements in a list.
fruits = ['apple', 'banana', 'orange']
for fruit in fruits:
    print(fruit)

Output:

apple
banana
orange
  1. Iterate through the characters in the string.
for char in 'Hello':
    print(char)

Output:

H
e
l
l
o
  1. Create a sequence of numbers.
for num in range(1, 5):
    print(num)

Output:

1
2
3
4
  1. create a list of items
fruits = ['apple', 'banana', 'orange']
for index, fruit in enumerate(fruits):
    print(index, fruit)

Output:

0 apple
1 banana
2 orange

The above is the basic usage of a for loop, where you can perform different operations within the loop body based on specific requirements.

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