Understanding Python's input() Function: Basics, Examples, and Type Conversion

Preface

Previously we shared the use of print(...) ; today we learn the input() function.

input() Learning Example

Basic Usage

The input() function pauses program execution and waits for user input from the keyboard, returning the entered text as a string.

Syntax:

variable = input(prompt)

prompt is an optional parameter that displays a prompt message before reading input.

The prompt can be a simple string such as "Enter your name:".

Basic Example

name = input("请输入名字：")
print("你的名字是", name)

Running this waits for input, then prints the entered name.

num = input("请输入你的幸运数值：")
print("你的幸运数字是" + num)

Note that the output "99" is a string, not a number.

How to Convert Input to Numeric Type?

Since input() always returns a string, you must convert it using int() or float() .

num = input("请输入你的幸运数值：")
print("你的幸运数字是" + num)  # string concatenation
num = int(num)  # convert to integer
print("幸运数字 + 1 =", num + 1)

After conversion, the variable can be used in arithmetic operations.

Precautions

Type conversion: use int() or float() when numeric input is needed.

Security and validation: always validate user input before using it.

Prompt visibility: provide a clear prompt to guide the user.

End of the input() tutorial.

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