Section 9.12-26, 9.129-26

Section 9.12-26, 9.129-26

1. Use of backslash and escape characters to search online

2. Input

print "how old are you?"age = raw_input()age = raw_input("how old are you?")

Result:

How old are you?

_ (Input)

 

How old are you? _ (Input)

 

print "how old are you?"raw_input(">>")

Result:

How old are you?

>> _

 

3. parameters, unpack, variables

from sys import argva,b,c = argvprint a,b,c

Result (the Object Name Is a. py followed by the parameter 1, 2)

 

A. py 1 2

 

Note that the number of parameter variables must correspond to the number of unincluded packages.

 

4. File Processing

from sys import argvfile1,file2 = argvprint "opening the file "a = open (file2,"w")print "truncating the file "a.truncate()print "two lines:"a.write("abcdef")a.write("\n")a.write('ghijk')a.write(\n)

Result:

Opening the file

Truncating the file

Two lines:

Abcdef

Ghijk

There are more file operation commands

View more information

 

5. Functions

def print_two(*args):    arg1,arg2 = args    print "arg1: %r,arg2: %r")%(arg1,arg2)def print_one(arg1):    print "arg1: %r"%arg1print_two("fan","year")print_one("cool")

Result:

'Fan' 'Year'

'Cool'

def add(a,b):    return a-bprint add(6,2)

Result:
4

 

Note that the function has strict indentation requirements.