Python 3.5 iterate through a list of dictionaries

Question

My code is

index = 0 for key in dataList[index]:     print(dataList[index][key]) 

Seems to work fine for printing the values of dictionary keys for index = 0.

But for the life of me I can't figure out how to put this for loop inside a for loop that iterates through the unknown number of dictionaries in dataList

Answer 1

You could just iterate over the indices of the range of the len of your list:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}] for index in range(len(dataList)):     for key in dataList[index]:         print(dataList[index][key]) 

or you could use a while loop with an index counter:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}] index = 0 while index < len(dataList):     for key in dataList[index]:         print(dataList[index][key])     index += 1 

you could even just iterate over the elements in the list directly:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}] for dic in dataList:     for key in dic:         print(dic[key]) 

It could be even without any lookups by just iterating over the values of the dictionaries:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}] for dic in dataList:     for val in dic.values():         print(val) 

Or wrap the iterations inside a list-comprehension or a generator and unpack them later:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}] print(*[val for dic in dataList for val in dic.values()], sep='\n') 

the possibilities are endless. It's a matter of choice what you prefer.