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Pythoncheatsheet

31 July 2024

Data Types 数据类型

Integers 整数

Integers are whole numbers. 整数是整数。

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my_number = 354

Floating Point Numbers 浮点数

Floats are numbers with decimal places. When you do a calculation that results in a fraction e.g. 4 ÷ 3 the result will always be a floating point number.

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my_float = 3.14159

Strings 字符串

A string is just a string of characters. It should be surrounded by double quotes.

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my_string = "Hello"

String Concatenation 字符串连接

You can add strings to string to create a new string. This is called concatenation. It results in a new string.

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"Hello" + "Angela"
#becomes "HelloAngela"

Escaping a String 转义字符串

Because the double quote is special, it denotes a string, if you want to use it in a string, you need to escape it with a “"

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speech = "She said: \"Hi\""
print(speech)
#prints: She said: "Hi"

F-Strings F-字符串

You can insert a variable into a string using f-strings. The syntax is simple, just insert the variable in-between a set of curly braces {}. ```python days = 365 print(f”There are {days} in a year”) ···

Converting Data Types 转换数据类型

You can convert a variable from 1 data type to another. Converting to float: float() Converting to int: int() Converting to string: str()

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