Python Learning summary 1:for loop control statement

use a list to determine the range of a for loop

>>> x = [0,1,2,3,4] for in x:    print  i,    1 2 3 4

Loop A String

' python '  for inch x:     Print i,    p y t h o n

Tuple for Loop

>>> x = [('http','HTTPS'),('Java','python')]>>> for(A, B)inchx:Print(A, b) ('http','HTTPS')('Java','python')

iterators

#file iterators, best practices for reading files>>> forLineinchOpen'Test.txt'):    Printline.upper () hello,word!#Dictionary iterators>>> testdict = {'name':'Ethon','Aender':'male'}>>> forKeyinchtestdict:PrintKey +':'+Testdict[key] Aender:malename:ethon

iterative Protocols : Some functions can be run on objects that support an iterative protocol

>>> testlist = [9,8,7,6,5]>>>PrintSorted (testlist) [5, 6, 7, 8, 9]>>>Printsum (testlist)35>>>PrintAny (testlist) True>>>PrintList (Open ('Test.txt'))['hello,word!']>>>PrintTuple (Open ('Test.txt'))('hello,word!',)
#tuples, list constructors, and joins can operate on objects that support iterative protocols>>>Print('--'). Join (Open ('Test.txt')) hello,word!

Use the range function to produce a range of loops

 for  in range (5):    print'was the currentvalue'       is The current value  is The current value  is The current value  is The current value  is the current value

Zip Zip : Use the zip function to merge two lists into a list of tuples.

>>> L1 = [1,3,5,7]>>> L2 = [2,4,6,8]print  zip (l1,l2) [(1, 2), (3, 4 ), (5, 6), (7, 8)]for in  Zip (l1,l2):    Print (A, b)    ( 1, 2)(3, 4)(5, 6) (7, 8)

Python Learning summary 1:for loop control statement