Reminiscing about Python basic data types

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data Type is an essential attribute of every programming language. Only by assigning a clear data type to the data can the computer process the data. Therefore, it is very necessary to use the data type correctly. Different languages have similar data types, but the specific representation methods Different, the following are commonly used data types in Python programming:

Commonly used data types:

1. Integer type int;
2. Float Point type float;
3. Boolean type bool;
4. String type str;

Integer type

• English is integer, abbreviated as int, which can represent positive numbers, negative numbers and zero
• Different base representation methods of integers:
  (1) Decimal system-> Default base system
  (2) Binary-> Starts with 0b
  (3) Octal-> Starts with 0o
  (4) Hexadecimal-> Starts with 0x

The code is as follows (example):

print('十进制',118)print('二进制',0b10101111)print('八进制',0o176)print('十六进制',0x1EA3)

Floating point number type

• Floating point number consists of integer part and decimal part
• Inaccuracy of floating-point number storage
• When using floating-point numbers for calculations, the number of decimal places may be uncertain

The code is as follows (example):

n1 = 1.1n2 = 2.2print(n1+n2) 输出的结果是3.3000000000000003解决方案: 导入模块decimal from decimal import Decimalprint(Decimal('1.1') + Decimal('2.2')) 输出的结果是3.3

Boolean type

• The value used to represent true or false
• True represents true, False represents falseThe first two letters must be capitalized
• Boolean values can be converted to integers
  • True -> 1
  • False -> 0

The code is as follows (example):

f1 = True f2 = Falseprint(f1+1) 输出的结果是2print(f2+1) 输出的结果是0

String type

• The string is again A sequence of characters called immutable
• Can be defined using single quotes ''double quotes"" or """"""
• Single quote and double quote strings must be on one line
• The string defined by triple quotes can be distributed on multiple consecutive lines

The code is as follows (example):

str1 = '我还年轻,吃苦趁现在'str2 = "我还年轻,吃苦趁现在"str3 = """我还年轻,吃苦趁现在"""

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