Print variable results Felix

Process finished with exit code 0

Operation result

Character encoding

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#pycharm 5.0.3(python2.6)
#Byte string-->decode('The original character encoding')-->Unicode Character string-->encode('New character encoding')-->Byte string
utf_8_a = 'test'
print(utf_8_a,type(utf_8_a),len(utf_8_a))  #Printing utf_8_a Content, Type and Length
unicode_a = utf_8_a.decode('utf-8') #Yes utf_8_a Decoding unicode
print(unicode_a,type(unicode_a),len(unicode_a))
gbk_a = utf_8_a.decode('utf-8').encode('gbk') #Decoding before encoding gbk
print(gbk_a,type(gbk_a),len(gbk_a)) #Printing gbk_a Memory, Type and Length
print(gbk_a.decode('gbk'))

('\xe6\xb5\x8b\xe8\xaf\x95', <type 'str'>, 6)
(u'\u6d4b\u8bd5', <type 'unicode'>, 2)
('\xb2\xe2\xca\xd4', <type 'str'>, 4)
//test

Process finished with exit code 0

#pycharm 5.0.3(python3.6)
#Python3 The string defined in the unicode，Therefore, it is not necessary to decode first, but can be directly encoded into a new character encoding:
#Character string-->encode('New character encoding')-->Byte string
utf_8_a = 'test'
print(utf_8_a,type(utf_8_a),len(utf_8_a))  #Printing utf_8_a Content, Type and Length
gbk_a = utf_8_a.encode('gbk')
print(gbk_a.decode('gbk'),type(gbk_a),len(gbk_a))

test <class 'str'> 2
//test <class 'bytes'> 4

Process finished with exit code 0

7. User input

#pycharm 5.0.3(python3.6)
name = input('Please input your name:')
#If you want the password you entered to be invisible, you can use it import getpass Modular
import getpass #Usually the calling module is written at the top
pwd = input('Your passwd:')
print('Hello,'+name) #String connections can be used“+"(Plus sign
print('Your password is:',pwd)

Please input your name:Felix
Your passwd:123
Hello,Felix
 Your password is 123.

Process finished with exit code 0

Operation result

8. module

import sys
print(sys.path) #Print environment variables
print(sys.argv) #Actually, what you print is the relative path, because pycharm There is a name, so the absolute path is printed directly.


import os
#print(os.path)
#cmd_res = os.system("dir")   #Execute commands without saving results
cmd_res = os.popen("dir").read() #No addition read，It's just stored in memory and needs to be used read read
print("-->",cmd_res)


#os.mkdir("new_dir") #Create directory
#import login #Find the module first to find in the current directory, if not error, solve, solve with the directory, or modify the environment variables.

9. slightly

10. Data type

Slightly

11. Data Operation

Slightly

12.if ...else

#pycharm 5.0.3(python3.6)
#Requirement: prompt user to enter username password
#Realization: User enters username password and verifies it(name = 'Felix',pwd = '123')
#      If the error occurs, the user name and password are output
#      If successful, the output is welcome. XXX!
import getpass #If you want the password you entered to be invisible, you can use it import getpass Modular
name = input('Please input your name:')
pwd =  int(input('Please input your pwd: '))
# pwd = int(getpass.getpass('Please input your pwd: ')) #You can hide password hints. Here the test is problematic. The password is not finished after entering.

if name == 'Felix' and pwd ==123:
    print('Welcome ',name)
else:
    print('Your name or pwd error')

Please input your name:Felix
Please input your pwd: 123
Welcome  Felix

Process finished with exit code 0

#pycharm 5.0.3(python3.6)
#Requirements: Set your age in the program, and then start the program to let users guess.
#Realization: After user input, according to his input prompt user input is correct, if the error, the prompt is guessed big or small
age_of_oldboy = 56
guess_age = input("guess age:")
if guess_age == age_of_oldboy:
    print("Yes,you got it.")
elif int(guess_age) > age_of_oldboy:
    print("think smaller")
else:
    print("think bigger")
#The above version can only enter one age at a time and need to run the program here.

guess age:28
think bigger

Process finished with exit code 0

Combining with the conditions, the user can constantly guess the age by using the cycle, but only give up to three chances, and then quit the program if the guess is wrong:

#pycharm 5.0.3(python3.6)
#while Circulation mode
age_of_oldboy = 56
count = 0
while count <3:
    guess_age = int(input("guess age:"))
    if guess_age == age_of_oldboy:
        print("Yes,you got it.")
        break
    elif guess_age > age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count +=1
else:
    print("You have tried too many times..fuck off")

guess age:20
think bigger
guess age:12
think bigger
guess age:30
think bigger
You have tried too many times..fuck off

Process finished with exit code 0

#pycharm 5.0.3(python3.6)
#for Circulation mode
age_of_oldboy = 56
count = 0
for i in range(3) :
    guess_age = int(input("guess age:"))
    if guess_age == age_of_oldboy:
        print("Yes,you got it.")
        break
    elif guess_age > age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
else:
    print("You have tried too many times..fuck off")

guess age:30
think bigger
guess age:56
Yes,you got it.

Process finished with exit code 0

13. cycle

   for loop

#pycharm 5.0.3(python3.6)
#Cyclic Printing 1 to 9
for i in range(10):
    print(i)

0
1
2
3
4
5
6
7
8
9

Process finished with exit code 0

#pycharm 5.0.3(python3.6)
#Requirement 1, circular printing 1 to 9, but encounter less than 5 cycles do not go, directly jump into the next cycle
#Here's where you can use it. continue
for i in range(10):
    if i<5:
        continue #Don't go down, go straight to the next cycle
    print(i)

5
6
7
8
9

Process finished with exit code 0

#pycharm 5.0.3(python3.6)
#Needs 2: It's still the above program, but when it encounters more than 5 cycles, it doesn't go away and exits directly.
for i in range(10):
    if i >5:
        break #Don't go down, just jump out of the whole cycle.
    print(i)

0
1
2
3
4
5

Process finished with exit code 0

  while loop

#pycharm 5.0.3(python3.6)
#Dead cycle
count = 0
while True:
    print('Wait...')
    count +=1

#pycharm 5.0.3(python3.6)
#Dead cycle
count = 0
while True:
    print('Wait...')
    count +=1

    if count == 5:
        print('Interrupt cycle')
        break

14. Interruption. Practice in 13 cycles

3. Reference

http://www.cnblogs.com/alex3714/articles/5717620.html <Blogger Blog Records>

http://www.runoob.com/

Note: This note is based on "Python 14 Baidu Video for Senior Boys", address: https://chuanke.baidu.com/v3628575-182242-1134376.html

Posted by Hitman2oo2 on Sun, 26 May 2019 17:29:25 -0700