Python basic three-----Basic data type Summary supplement

1. A small problem:

Deleting a list element during a loop will be different from the expected result, but will not cause an error

Lis =[11,22,33,44,55] forIinchRange (len (LIS)):#When you use range () for the first time, the value is saved by default, and the value in the subsequent loop value is fixed to dead.    Print(i)delLis[i]Print(LIS)delLis[1::2]Print(LIS) forIinchRange (0, 2):    Print(I,type (i))delLis[i]Print(LIS)

View Code

For dictionary dict: Cannot delete dictionary key value pair during loop, error

DIC = {'K1':'v1','K2':'v2','A3':'v3'} forIinchDIC:if 'k' inchI:delDic[i]

Correct procedure 1

Dic1 = {} for in dic:    if'k' is not inch I:         = Dic1print(DIC1)

Correct Practice 2: Put the  deletion to the list, the loop list to delete

DIC = {'K1':'v1','K2':'v2','A3':'v3'}l= [] forIinchDIC:if 'k' inchi:l.append (i) forIinchL:delDic[i]Print(DIC)

2. Tuple issues (Interview questions)

TU1 = (1= (2)print(Tu1,type (TU1))   #  1 <class ' int ' >Print (Tu2,type (TU2))   #  (2,) <class ' tuple ' >= ([1= ([1],)  Print(Tu1,type (TU1))    #  [1] <class ' list ' >print(TU2, Type (TU2))    #  ([1],) <class ' tuple ' >

Python basic three-----Basic data type Summary supplement