Basic knowledge of python syntax-Python Tutorial-php.cn

Basic knowledge of python syntax

王林

Release： 2019-10-29 18:06:53

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Basic knowledge of python syntax

1. Numeric types and operations

1. Integer types

can be positive or negative, with no limit on the value range

pow（x，y）：计算x^y

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2. Floating point number type

There is an uncertain mantissa

round(x,d)：对x四舍五入，d为小数截取位数

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e/E：a*10^b

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3. Complex number type

z=a+bj
z.real=a    z.imag=b

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2. Numerical operation operator

eg：x//y :整数除 10//3=3 x%y :求模  10%3=1 x**y=x^y

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3. Numerical operation function

abs(x) :绝对值  abs(-10)=10
divmod(x,y) :商余  divmod(10,3)=(3,1)
pow(x,y,z) :幂余，（x**y）%z
max(x1,x2,...xn) :求最大值 min(x1,x2,...xn) :求最小值
int(x) ：将x变成整数 float(x) :将x变成浮点数
comlex(x) :将x变成浮点数

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4. Representation of string type (consisting of a pair of single quotes or An ordered sequence of characters represented by double quotes)

[M:N:K], slice the string according to the step size K

Special characters: "\b ": Go back "\n": Line feed (the cursor moves to the beginning of the next line) "\r": Carriage return (the cursor moves to the beginning of this line)

5. String processing function

len(x): length str(x): string form corresponding to any type x

chr(x): x is Unicode encoding, return its corresponding character ord (x) : On the contrary

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