Python while loop if elif else judgment

1. While loop

Contact Code: M=0#defines the value of m as 0Print('before the cycle begins m=%s'%m) whileRange (10): M+=1#value of +1 per cycle m    Print("The first%s loop, at which time m=%s"%(M, m))ifm%2==0:Print(m)ifM >=10:        Print('begin to Judge M, at this time m=%s'%m) Break            

Operation Result:

The loop starts beforethe m= 0 1th loop, atwhich time m =1 2nd Loop, at which time M =22 3rd loop, M =3 4th Loop, at this time m =44 5th Loop, atthis time m = 5 6th Loop, at this time m=66 7th Loop, atthis time m =7 8th Loop, atthis time m =88 9th Loop, at this time m =9 10th loop, at this time m= 1010 began to Judge M, at this time m=10

2. If Else judgment

Simple example: Boy_age= 32Count=0 whileTrue:count+ = 1Oldboy_age= Input ('Oldboy_age:')    ifOldboy_age:oldboy_age=Int (oldboy_age)Else:        ifCount = = 3:            Print('Sorry,%s times exhausted, please rerun'%count) Break        Else:            Print('you still have the%s chance .'% (3-count)) Continue    ifOldboy_age = =Boy_age:Print('Yes, the answer is right.')         Break    elifOldboy_age >Boy_age:Print('Take a little guess ...')    Else:        Print('go big and guess ....')    ifCount = = 3: S= Input ('would you like to re-guess ...? (y/n)')        ifs! ='N': Count=0 Break

This code is used as a test learning, there is an imperfect situation, you can copy the code to run the test locally.

s = 5
S1 = Int (input (' A: '))
If S1 > 5:
    Print (' No,is small ')
Elif S1 < 5:
    Print (' No,is big ')
Else
    Print (' Yes, bingo ')

a lot of detailed judgment, if elif Else

3. Keyword explanation

 Break    # return, exit the entire loop Continue    # return, exit when secondary loop

Python while loop if elif else judgment