Stupid way to learn Python (11-20)

The following learning content is based on Python2

11. Questions

Print "How is old is?", age = Raw_input () print "So, you're%r old."% Agepython ex11.pyhow old is you? 35So, you're ' re ' old

Input () and raw_input () are Python built-in functions that interact with the user, but function differently.

Raw_input can represent arbitrary strings

Input "on the string to be added"

type int best uses input

12. Prompt others

For Raw_input, you can also let it show a hint that tells others what to enter. You can put a string between () that you want as a hint, as follows:

y = raw_input ("Name?")

Pydoc is a python built-in official document, similar to the man in Linux

13. Parameters, unpacking, variables

From sys import argv script, first, second, third = argv print "The script is called:", script print "Your first variable  is: ", first print" Your second variable are: ", second print" Your third variable is: ", Thirdpython ex13.py first 2nd 3rdThe Script is called:ex13.py Your first variable is:first Your second variable is:2nd Your third variable is:3rd

14. Tips and Delivery

from sys import argvscript, user_name = argvprompt =  ' > ' print  "Hi %s, i ' M the %s script."  %  (user_name, script) print  "I ' d like to ask you a few  Questions. " print  "do you like me %s?"  % user_namelikes = raw_input (Prompt) print  "where do you live %s?"  % user_name lives = raw_input (Prompt)  print  "what kind of  Computer do you have? "  computer = raw_input (prompt)  print  "" " alright, so you said  %r about liking me. you live in %r. not sure where  that is. And you have a %r computer. Nice.  "" " %  (Likes, lives, computer) $ python ex14.py zed hi zed,&Nbsp;i ' M the ex14.py script. i ' d like to ask you a few  questions. do you like me zed? > yes where do you  Live zed? > america what kind of computer do you have?  > Tandy Alright, so you said  ' yes '  about liking me.  You live in  ' America '.  not sure where that is. and you  have a  ' Tandy '  computer. nice.

15. Read the file

$ VI ex15_sample.txtthis is stuff I typed to a file. It is really cool stuff. Lots and Lots of fun to has in here.

All we have to do is open the ex15_sample.txt.

From sys import argvscript, filename = argvtxt = open (filename) print "Here ' s your file%r:"% filenameprint txt.read () prin T "Type the filename agein:" File_again = Raw_input (">") txt_again = open (file_again) print txt_again.read ()

16. Read and Write files

from sys import argvscript, filename = argvprint  "We ' re going to  erase %r. "  %filenameprint  "If you don ' T want that, hit cril-c (^c)." print  "If you do want that, hit return." Raw_input ("?") print  "Opening the file ..." Target = open (filename,  ' W ') print  "Truncating  the file. goodbye! " Target.truncate () print  "Now i ' M going to ask you for three lines." Line1 = raw_input ("line 1: ") line2 = raw_input ("line 2: ") line3 =  raw_input ("line 3: ") print  "I ' m going to write whese to the  file. " Target.write (line1) target.write ("\ n") target.write (line2) target.write ("\ n") target.write (line3) target.write ("\ n" ) print  "And finally, we close it." Target.close ()

17. More File operation

From Os.path Import exists

Print "%r"% exists (to_file) #查看to_file有有没用存在, returns a Boolean value

Print "d%"% len (indata) #查看有多少个字节

# Write data to To_file, write to Indata

Output = open (To_file, ' W ')

Output.write (Indata)

Output.close () #关闭

18. Commands, variables, codes, functions

#coding: Utf-8def Nan_nad_nv (nan_count,nv_count): print "Our It boys have%d. "% Nan_count print" We have it girls with%d. The number of "% nv_countprint" IT staff: >>> Nan_nad_nv (60,20) Results The number of IT staff is: we have 60 of it boys. We have 20 of it girls.

19. Functions and variables

def cheese_and_crackers (Cheese_count, boxes_of_crackers): print "You had%d cheeses!"% cheese_count print "you h Ave%d boxes of crackers! "% boxes_of_crackerscheese_and_crackers (20, 30) results you have a total of cheeses! You have a boxes of Crackers!amount_of_cheese = Amount_of_crackers = Cheese_and_crackers (Amount_of_cheese, Amount_o F_crackers) Results you have cheeses! You have boxes of crackers!

20. Functions and Files

Grasp the following parameter meanings

F.seek (0)

F.readline ()

Stupid way to learn Python (11-20)