How do you write a for loop in Python?

2 years ago
Noah Thompson
1 minute

The basic syntax of using a for-in loop in Python is:

for 变量 in 可迭代对象:
    # 循环体代码

In this case, an iterable object is a sequence (such as a list, tuple, or string) or an iterable object (such as a dictionary or set), and the variable is the value extracted each time during the loop.

Here are some examples of for-in loops:

  1. Iterate through the list:
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)
  1. Iterate through the string.
text = "Hello"
for letter in text:
    print(letter)
  1. Iterate through the keys of the dictionary.
person = {"name": "Alice", "age": 25}
for key in person:
    print(key)
  1. Iterate over the values of a dictionary.
person = {"name": "Alice", "age": 25}
for value in person.values():
    print(value)
  1. Iterating through the key-value pairs of a dictionary:
person = {"name": "Alice", "age": 25}
for key, value in person.items():
    print(key, value)

I hope these examples can help you understand how to use for-in loops in Python.

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