First knowledge of Python 4

Function: Determine if it is a number

Law One:

VI 11.py

#！ /usr/bin/python

def fun ():

STH = raw_input ("Please input something:")

Try

if Type (int (sth)) ==type (1):

Print "%s is a number"%sth

Except ValueError:

Print "%s is not number"%sth

Fun ()

Save and exit

[[email protected] day2]# python 11.py

Please input something:45

is a number

-----------------------------------------------

Law II:

[Email protected] day2]# VI 12.py

#!/usr/bin/python

Import Sys

def isnum (s):

For I in S:

If I in "0123456789":

Pass

Else

Print "%s is not a number"%s

Sys.exit ()

Else

Print "%s is a number"% s

Isnum (Sys.argv[1])

Save and exit

[[email protected] day2]# Python 12.py 123

123 is a number

[[email protected] day2]# python 12.py 123kh

123kh is not a number

--------------------------------------

Print System process number

VI 13.py

#！ /usr/bin/python

Import Sys

Import OS

def isnum (s):

For I in S:

If I not in ' 0123456789 ':

Return False

Return True

For I in Os.listdir ('/proc '):

If Isnum (i):

Print I

Save and exit

[[email protected] day2]# python 13.py

1

2

3

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First knowledge of Python 4