Python-sys module, exception

Exercise 1: Title: Give a positive integer not more than 5 digits, requirements: First, it is a number of digits, second, in reverse order to print out the figures.

#encoding =utf-8

While True:

Try

Num=int (raw_input ("input a number not more than 5 digits:"))

Except

"Plese input again:"

Else

If Len (num) <=5:

Break

Print len (num)

Print str (num) [::-1]

Exercise 2: Please enter the first letter of the day of the week to determine the day of the week, if the first letter, then continue to judge the second letter.

#encoding =utf-8

week={' m ': ' Monday ', ' tu ': ' Tuesday ', ' W ': ' Wednesday ', ' th ': ' Thursday ', ' F ': ' Friday ', ' sa ': ' Saturday ', ' s ': ' Sunday '}

Prefix=raw_input ("Input the first letter:")

If Week.has_key (Prefix.lower ()):

Print Week[prefix.lower ()]

Else

Prefix2=raw_input ("Input The second letter:")

If Week.has_key (Prefix.lower () +prefix2.lower ()):

Print Week[prefix.lower () +prefix2.lower ()]

Exercise 3: Two 3-row, 3-column matrices that add data to their corresponding positions and return a new matrix:

X = [[12,7,3],
[4, 5,6],
[7, 8,9]]

Y = [[5,8,1],
[6,7,3],
[4,5,9]]

#encoding =utf-8

x = [[12,7,3],

[4, 5,6],

[7, 8,9]]

y = [[5,8,1],

[6,7,3],

[4,5,9]]

z = [[0,0,0],

[0,0,0],

[0,0,0]]

#print x, y

For I in range (len (x)):

Print "I:", I

For j in Range (3):

Print "J:", J

Print "x[%s][%s]:%s"% (I,j,x[i][j])

Print "y[%s][%s]:%s"% (I,j,y[i][j])

Z[I][J]=X[I][J]+Y[I][J]

Print "z[%s][%s]:%s"% (I,j,z[i][j])

Print Z

C:\python27\scripts>python task_test.py

i:0

j:0

X[0][0]:12

Y[0][0]:5

Z[0][0]:17

J:1

X[0][1]:7

Y[0][1]:8

Z[0][1]:15

J:2

X[0][2]:3

Y[0][2]:1

Z[0][2]:4

I:1

j:0

X[1][0]:4

Y[1][0]:6

Z[1][0]:10

J:1

X[1][1]:5

Y[1][1]:7

Z[1][1]:12

J:2

X[1][2]:6

Y[1][2]:3

Z[1][2]:9

I:2

j:0

X[2][0]:7

Y[2][0]:4

Z[2][0]:11

J:1

X[2][1]:8

Y[2][1]:5

Z[2][1]:13

J:2

X[2][2]:9

Y[2][2]:9

Z[2][2]:18

[[17, 15, 4], [10, 12, 9], [11, 13, 18]]

One line is done:

>>> [[X[i][j]+y[i][j] for I in range (3)] for J in Range (3)]

[[17, 10, 11], [15, 12, 13], [4, 9, 18]]

SYS.ARGV practice to count the number of letters in all input parameters.

#encoding =utf-8

Import Sys

Print "The command line arguments is:"

list=sys.argv

Num=0

Print List

For i in List[1:]:

if (i>= ' a ' and i<= ' Z ') or (i>= ' a ' and i<= ' Z '):

Num+=1

Print num

C:\python27\scripts>python task_test.py A B c D

The command line arguments is:

[' task_test.py ', ' A ', ' B ', ' C ', ' d ']

4

The second question: The parameters you enter are all numbers, calculating the cumulative sum of all the numeric parameters

#encoding =utf-8

Import Sys

Print "The command line arguments is:"

list=sys.argv

Sum=0

Print List

For i in List[1:]:

Sum+=float (i)

print "sum:", sum

C:\python27\scripts>python task_test.py 1 1 1.1

The command line arguments is:

[' task_test.py ', ' 1 ', ' 1 ', ' 1.1 ']

sum:3.1

According to Wu Old idea:

#encoding =utf-8

Import Sys

If Len (sys.argv[1:]) >=1:

Sum=0

Else

sum = None

For i in Sys.argv[1:]:

Try

Sum+=float (i)

Except

continue# here means that there is no place where the numbers are not wrong,

Print sum

#encoding =utf-8

Import Sys

Import OS

def readfile (filename):

F=open (filename)

While True:

Line=f.readline ()

If Len (Line.strip ()) ==0:

Break

Print Line

F.close ()

Print "sys.argv[0]--------", sys.argv[0]

Print "sys.argv[1]--------", sys.argv[1]

Print "sys.argv[2]--------", sys.argv[2]

If Len (SYS.ARGV) <2:

Print "No action specified."

Sys.exit ()

If Sys.argv[1].startswith ('--'):

option = sys.argv[1][2:]

if option = = ' Version ':

Print "Version 1.2"

elif option = = ' help ':

Print "" "

This program .....

--version:prints the version number

--help:display this Help "" "

Else

print "Unknow option"

Sys.exit ()

Else

For file in sys.argv[1:]:

#print file

ReadFile (file)

Sys.stdin.readline () = = Raw_input ()

>>> Raw_input ()

Sd

' SD '

>>> Sys.stdin.readline ()

Sadf

' Sadf\n '

>>>

#coding =utf-8

Import OS

Import Sys

Counter=1

While True:

Line=sys.stdin.readline ()

If not Line.strip ():

Break

Print "%s:%s"% (counter,line)

Counter +=1

>>> Import Sys

>>> sys.version

' 2.7.14 (v2.7.14:84471935ed, Sep, 20:25:58) [MSC v.1500-bit (AMD64)] '

>>>

>>> sys.stdout.write ("sdfsdffffffffff\n")

Sdfsdffffffffff

#coding =utf-8

Import OS

Import Sys

For I in range (3):

Sys.stdout.write ("Gloryroad")

print ' \ n ', ' _ ' *60, ' \ n '

For I in range (3):

Sys.stderr.write ("Error Error")

Output the standard to the screen instead of to the file

>>> Import OS

>>> Import Sys

>>> Sys.stdout=open ("D:\\a.txt", "W")

>>> print "Love You"

>>> "Love You"

>>> FP

>>> print "Hello"

>>> Stdout.flush ()

Traceback (most recent):

File "<stdin>", line 1, in <module>

Nameerror:name ' stdout ' is not defined

>>> print ""

>>> Sys.stdout.flush ()

>>> Print

Python-sys module, exception