How is the print function used in Python?

1 year ago
Jackson Davis
2 minutes

The print function is used to display output, which can include strings, variables, expressions, and more.

Basic usage:

print('Hello, World!')  # 打印字符串
print(123)  # 打印整数
print(3.14)  # 打印浮点数

When printing multiple items, you can separate them with commas.

name = 'Alice'
age = 20
print('My name is', name, 'and I am', age, 'years old.')  # 打印多个字符串和变量

Strings can be concatenated using the plus sign.

name = 'Alice'
age = 20
print('My name is ' + name + ' and I am ' + str(age) + ' years old.')  # 字符串拼接和类型转换

You can format output using placeholders.

name = 'Alice'
age = 20
weight = 60.5
print('My name is %s and I am %d years old. My weight is %.1f kg.' % (name, age, weight))  # 使用占位符格式化输出

In Python 3.6 and later versions, you can also use f-strings for formatting output.

name = 'Alice'
age = 20
weight = 60.5
print(f'My name is {name} and I am {age} years old. My weight is {weight:.1f} kg.')  # 使用f-string格式化输出

Important notes:

  1. By default, the print function will add a newline character at the end of the output. If you do not want a newline, you can use the end parameter to control it, for example: print(‘Hello’, end=”).
  2. The print function can take multiple arguments and automatically add spaces to separate them, for example: print(‘Hello’, ‘World’) will output Hello World.
  3. The parameters of the print function can be objects of any type. If you need to output a custom object, you can specify the object’s string representation by defining the __str__ method in the class.
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