The day3 of Python learning

1. Dictionary operation

1   for  in dic:                          # loop A dictionary 2      print  key,dic.get (key)3 for in    dic.items ():4      print  k,v

2. Collection

1 #-*-coding:utf-8-*-2 3S1 ={"a","b","C","D"}4S2 ={"a","b","F"}5 PrintS1.difference (S1)#calculate two different parts of a set6 PrintS1.intersection (S1)#intersection7 PrintS1.issubset (S2)#determine if S1 is a subset of S28 PrintS1.issuperset (S2)#determine if S1 is the parent set of S29 #

3. Character encoding

4. File operation

The day3 of Python learning