Python base point record 1

1 Variable: A variable is a word, only a single value

1 python data types interage, floats, booleans, string, etc.

2 Python is a case-sensitive language

3 python variables can be overwritten at any time

2 Pyt h on multiline comment is through "" "" * * * * """ "To achieve the 3 Pyth o n There are 6 kinds of arithmetic operators   +,-, *,/,** ( power ),% 4 Python inside x^m, written x**m 5 a String is passed   '   ' or ' "   wrapped in a string 6 Python is through   \   to implement the escape character. 7 We can use   ""   to avoid the appearance of escaped characters

　　Set the variable fifth_letter to the fifth character of Monty

Fifth_letter = "MONTY" [4]

Print Fifth_letter

8 describes the first method of string,len () to find the length of the string

Parrot = "Norwegian Blue"

Print Len (Parrot)

9 describes the second method of String , Lower () converts all uppercase letters to lowercase letters

Parrot = "Norwegian Blue"

Print Parrot.lower ()

1 0 describes the third method of String , Upper () puts all the Small write letters into Big Write Letters

　　 convert lowercase letters in parrot to uppercase and print

Parrot = "Norwegian Blue"

Print Parrot.upper ()

One You can use + to connect two strings 1 2 Introduction str () converts a number to a string

Set a variable pi value to 3.14 to convert pi to string

PI = 3.14

Print str (PI)

Print "The value of pi is around" + str (3.14)

Python base point record 1