The Has_key method of the dictionary in Python is changed to in the 3.4 version

1>>> A={1:'a', 2:'b'}2>>> 1incha3 True4>>>'a' incha5 False6>>> 2incha7 True8>>>

That is, you can determine whether a key exists in the dictionary;

1 >>> a.has_key (1)2 Traceback (most recent): 3   File "<pyshell#27>", Line 1, in <module>4     a.has_key (1) 5 attributeerror: ' Dict ' object has no attribute ' Has_key '

The Has_key method of the dictionary in Python is changed to in the 3.4 version