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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