Iterate over a dict except for x item items

问题

I have a dict in this format:

d_data = {'key_1':value_1,'key_2':value_2,'key_3':value_3,'key_x':value_x,'key_n':value_n}

and I have to iterate over it's items:

for key,value in columns.items():
    do something

except for the pair:

'key_x':value_x

回答1:

You can use a list comprehension or generator expression to filter:

for key,value in (i for i in columns.items() if not i==('key_x',value_x)):
    do something

回答2:

Simply use the continue statement, to skip ahead to the next iteration of the for loop:

for key,value in columns.items():
    if key == 'key_x':
        continue
    # do something

回答3:

You can also iterate through the output of filter built-in method (which yields a generator in Python3+), this way:

>>> for x in filter('key_x'.__ne__, d_data):
        print(x, d_data[x])


key_3 value_3
key_n value_n
key_1 value_1
key_2 value_2 

来源：https://stackoverflow.com/questions/36184371/iterate-over-a-dict-except-for-x-item-items