Basic introduction to floating point types in Python (code examples)

The content of this article is an introduction to the basic content of floating point types in Python (code examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Introduction to floating point numbers

float (floating point type) is one of the basic data types of Python. Python’s floating point numbers are similar to decimal sums in mathematics. Double type in C language;

2. Floating-point operations

The way floating-point numbers and integers are stored inside the computer are different, and integer operations are always Accurate, however floating-point operations may have rounding errors. For example, if you observe the following operation, it is easy to conclude in mathematics that the result should be 0.8965, but the result obtained using the program operation is: 0.8965000000000001;

a = 1.25
b = 0.3535
print(a-b)  #输出：0.8965000000000001

The results of integer and floating-point operations are also floating-point. ;

a = 1
b = 0.25
print(a + b,type(a+b))  #输出：1.25 <class>

print(a - b,type(a-b))  #输出：0.75 <class>

print(a * b,type(a*b))  #输出：0.25 <class>

print(a / b,type(a/b))  #输出：4.0 <class></class></class></class></class>

float() function can convert integers and strings into floating point numbers.

#整数转为浮点数
a = 1
print('a的类型为：',type(a))   #输出：a的类型为： <class>
print(float(a))      #输出：1.0
print('转换后a的类型为：',type(float(a)))  #输出：转换后a的类型为： <class>
#字符串转为浮点数
b = '123'
print('b的类型为：',type(b))   #输出：a的类型为： b的类型为： <class>
print(float(b))      #输出：123.0
print('转换后b的类型为：',type(float(b)))  #输出：转换后b的类型为： <class></class></class></class></class>

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