Python Foundation One

First, Introduction

The Python section is based on Python3

Print ("Hello world!")

Second, the variable

Python does not have the concept of constants, everything can be variables, but the habitual use of all uppercase characters to represent constants, such asAGE_OF_RAP = 56

Variable refers to the amount of variation that can be used to refer to the contents of an address stored in memory. There are the following rules:

1. Variable names can only be any combination of letters, numbers, or underscores

2. The first character of a variable name cannot be a number

3. The following keywords cannot be declared as variable names [' and ', ' as ', ' assert ', ' Break ', ' class ', ' Continue ', ' Def ', ' del ', ' elif ', ' Else ', ' except ', ' exec ', ' FINA Lly ', ' for ', ' from ', ' global ', ' if ', ' import ', ' in ', ' was ', ' lambda ', ' not ', ' or ', ' pass ', ' print ', ' raise ', ' return ', ' try ', ' while ', ' with ', ' yield ']

Three, string

A string is one of the python underlying data types, consisting of either single or double quotation marks, such as ' I love python ' or ' I love Python ', which is immutable and therefore cannot be modified once established

Four, read user input

Python3 deprecated Raw_input (), only input () is used to read the user's inputs

Name = input ("what isyour name? ") ")

V. List

One of the important basic data types

List1 = ['physics'chemistry', 1997, += [1, 2, 3, 4, 5= ["a""b""C"  "D"]

VI. Dictionary

One of the important basic data types

' ABC ': 456'abc': 123, 98.6:37}

Seven, Process Control

x = Int (input ("Please enter your total score:"))ifX >= 90:    Print('Excellent')elifX>=80:    Print('Liang')elifX >= 70:    Print('in')elifX >= 60:    Print('qualified')Else:    Print('not qualified')

Eight, circulation

# !/usr/bin/python  = 0 while count < 9:   print'thecount is:'  , Count   print"good bye! "

Python Foundation One