Python experience (01)-variables, functions, and basic control statements

Debian5 was installed today. I didn't expect python to be installed in the basic environment, so I tried this legendary language.

The following is a series of simple examples to experience,CodeYou can directly paste and save the files, all of which pass the test.

For more information, see pdf. You can download a PDF file from this address.

Case 1:

# Used for comments, but the first line #! AlsoProgramIt is pointed out that this code is executed by/usr/bin/python, so the file name can not be py
If you are happy, you can add the property X to helloworld. py, so that you can change it to any file name for direct execution, such as hello.

# ! /Usr/bin/Python
# Filename: helloworld. py
Print   ' \ N \ thello world! That \ ' S python! \ N '
# If you want the. py file to be executable: chmod A + x helloworld. py

Case 2:

You can directly assign values to variables without declaration. If/Elif/else statements do not need to include judgment statements and end;

Code # ! /Usr/bin/Python
# Filename: raw_input.py

Number =   23   # Here no ;But you can add; either
Guess = INT ( Raw_input( " Enter an integer: " )); # String, can use 'Or"

If Guess = Number: # Notice: No ()And there's :
Print   ' Congratulations, you guessed it. '
Print   ' (But you do not win any prizes !) '
Elif Guess < Number:
Print   " No, it's a little higher than what you input. "
Else :
Print   ' No, it \ ' S a little lower than what you input. '

Print   " Done! " ;

 Case 3: Guess the number game and exit if the game is incorrect after five guesses

While loop, break jumps out; saves {} similar to the C language, and uses a pair to determine the statement Block

Code # ! /Usr/bin/Python
# Filename: While. py

Number =   23
Hitting =   False
Loop =   5

While   Not  Hitting:
Guess = INT (raw_input ( " Guess what ( "   + STR (loop) + " Times left ): " ))
Loop = Loop - 1 ;
If Loop = 0:
Print   " \ Ttoo stupid, you lost! "
Break ;
If Guess > Number:
Print   " \ Tyour number is bigger than that. "
Elif Guess < Number:
Print   " \ Tyour number is littler than that. "
Else :
Hitting =  True;
Print   " \ Tyou win, excellent baby! "
Print   " \ T -- = -- [done] -- = -- "
# The done statement is line to while, so running out of while then "done" execute.

Example 4: function, default parameter, return value; docstring

Code # ! /Usr/bin/Python
# Filename: function. py

Def Value (Num =  3 ): # There's Default Parameter.
''' Coded by Phoenix:

RET (x) = x ^ x '''   # Docstrings
RET =   1 ;
For I In Range (0, num):  # Notice, there is:
RET = RET * Num
Return  RET

Number = INT (raw_input ( " Input a number: " ))
Print Value ()
Print Number ** Number
Print Value (number) # Output the x ^ X, by the way, you can use: X ** x
Print Value. _ Doc __   # Output docstrings