Getting started with Python first article

Day.1

A.python Foundation

1. Basic

Print ('helloWorld')

2. Operating Environment

# inside the file: #    # !/usr/bin/env python # file name: #    . /2. py#Linux Environment in order to run ## in the PY3 environment without adding, PY2 head must be added ==> environment in the default use of ASCII interpretation, So Chinese explanation does not pass ##  -*-Coding:utf8-*-

3. Variable ==> can be understood as Unknown X (FOG)

Note: Variables can only be made up of letters, numbers, and underscores.

Exception: 1. Cannot start with a number

2.python keywords cannot be used: [' and ', ' as ', ' assert ', ' Break ', ' class ', ' Continue ', ' Def ', ' del ', ' elif ', ' Else ', ' except ', ' exec ', ' fin Ally ', ' for ', ' from ', ' global ', ' if ', ' import ', ' in ', ' was ', ' lambda ', ' not ', ' or ', ' pass ', ' print ', ' raise ', ' return ', ' tr ' Y ', ' while ', ' with ', ' yield ']

3. It's best not to repeat the python built-in stuff.

4. Conditional Statement ①if ==> Else

1 """The format is as follows2 if ( how how How):3 deal with what?4 Else: (else can be omitted)5 deal with what?6 """7 #For example #8Password =Input (Please enter password:)9 if(password = 123456):#The default password is 123456# #注意if和else后有个冒号 #Ten     Print("Password is correct") One Else: A     Print("Password Error")

②if ==> Elif

1user_name = input ("Please enter your login account")2 if("user_name = = Administrator"):3     Print("welcome, Super Admin")4 elif("user_name = = Forbidden Flower")5     Print("Welcome, Forbidden Flower")6 elif("user_name = = Guest")7     Print("Welcome, Guest")8 Else:9     Print("Please sign up for a new account or log in with a Guest account")

③while ==> Break & Continue

1 """ 2 The format is as follows 3 While True 4     handle how 5     loops until the condition is not true.  6"" "7#break forced interrupt Loop #8#  Continue exit the current loop and continue the next loop #

Exercises:

1. Use while loop input 1 2 3 4 5 6 8 9 10

1 count = 12 while (Count <=):3     if(count = = 7):  4         count = Count + 15         continue6     else:  7         print  (count)8     count = count + 1

Exercises 1

2. For all numbers of 1-100

1 count = 12 a1 = 03 while (Count <=):4     a1 = A1 + Count 5     Count = Count + 16Print(A1)

Exercises 2

3. All odd numbers in output 1-100

1 count = 12while (Count <=):3     if (count% 2 = = 1): /c7>4         print(count)5     else:6         Pass7     count = count + 1

Exercises 3

4. All even numbers in output 1-100

(See Exercise 3)

5, Beg 1-2+3-4+5 ... 99 of all numbers of the and

1 count = 12 a1 = 03while (count<100):4     if (count% 2 = = 1):5         a1 = A1 + count6     else:  7         a1 = A1- count8     count = count + 19Print(A1)

Exercises 5

6, the user login (three times the opportunity to retry) (the password is correct, the wrong prompt password error, error 3 times after the prompt to log in tomorrow)

1Count = 42  while(Count >0):3passkey = input ('Please enter your password:')4     if(passkey = ="123456"):5         Print("Password is correct")6          Break7     Else:8         Print("password error, number of times left")9Count = count-1Ten         Print(count) One         if(Count = =0): A             Print("Please try again tomorrow .") -         Else: -             Pass

Exercises 6

Getting started with Python first article