Resolved an error problem when Python obtained a value that did not exist in the dictionary dict

Description: In Python2.7, if you want to get a value from the dictionary, but the value may not exist, you should add the following sentence:

Here's an example:

t= {}
if t.get('1'): # right: This through key It's a good way to ask if it exists 
 print(t['1'])
 print('right')

if t['1']: # wrong: This direct check to see if there is an error because it will be called before the check 
 print(t['1'])

Additional notes:

dict.get(key, default=None)  Method details: 

Parameters:

key -- This is the Key to be searched in the dictionary.

default -- This is the Value to be returned in case key does not exist.

If default is not specified and no value is found, None is returned