# Python exercises (basic knowledge exercises (i))

Source: Internet
Author: User
Tags for in range

1. Using while loop output 1 2 3 4 5 6 8 9 10
`# !/usr/bin/env python # -*-encoding:utf-8-*-  = 1 while n <=:   if n = = 7:      pass# instead of continue, because will skip this cycle, n can not +1,n forever ==7, never skip this cycle.    Else:      print(n)   + = 1   #  Print (' WSS ', n)`
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```# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0 while n <= 9:    + = 1    if n = = 7:        pass
#  Change to continue can, because although jumped out of this cycle, but the next time the loop n can be +1    Else:          Print(n)```
View Code2. For all numbers of 1-100
`# !/usr/bin/env python # -*-encoding:utf-8-*-  #S is the sum of all previous numbers  while n <=:    + =    1 + = N     #  print (s) #输出每次循环的总和 print# output final sum`
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`# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0 for in range (1,101):    #  print (n)    s + = N Print (s)`
View Code3. All odd numbers in output 1-100
`# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0 while n <=    :+ = 1    if n% 2 = =1        :  Print(n)`
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`# !/usr/bin/env python # -*-encoding:utf-8-*-  for  in range (1,101,2):        print(n)`
View Code4. All even numbers in output 1-100
`# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0 while n <=    :+ = 1    if n% 2 = = 0        :  Print(n)`
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`# !/usr/bin/env python # -*-encoding:utf-8-*-  for  in range (2,101,2):        print(n)`
View Code5, Beg 1-2+3-4+5 ... 99 of all numbers of the and
```# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0;s = 0 while n <= 98:    + = 1    if n% 2 = = 0:        -=

N
else
:        +
=    n
#
print (s) #输出每次循环运算的结果
print
#
Output final result of Operation
```
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`# !/usr/bin/env python # -*-encoding:utf-8-*-  = 0 for in range (1,100):        #  print (n)        if n% 2 = = 0            :-=        nelse:            + = N  Print(s)`
View Code6. User Login (three chance retry)
`#!/usr/bin/env python#-*-Encoding:utf8-*-ImportGetpasscount=0 whileCount < 3: User= Input ('Please enter user name:') PWD= Getpass.getpass ('Please enter your password:')    ifuser = ='WSS'  andPWD = ='123':        Print('Welcome to login')        Print('..........')         Break    Else:        Print('incorrect user name or password') Count+ = 1`
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`#!/usr/bin/env python#-*-encoding:utf-8-*-ImportGetpassusername='WSS'Password='123'Flag=0deflogin (): User= Input ('Username:') passwd= Getpass.getpass ('Password:')    returnUser,password whileFlag<3: user,passwd=Login ()ifUsername = = User andPassword = =passwd:Print('Hello,jason')         Break    Else: Flag+ = 1Print('Error,input again')`
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Python exercises (basic knowledge exercises (i))

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