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I have two lists:
country_name = ['South Africa', 'India', 'United States']
country_code = ['ZA', 'IN', 'US']
I want to group the country name and its corresponding code together and then perform a sort operation to do some processing
When I tried to zip these 2 lists, I am getting the 1st character from both the lists as the output.
I also tried doing this:
for i in xrange(0,len(country_code):
zipped = zip(country_name[i][:],country_code[i][:])
ccode.append(zipped)
to zip the entire string, but it didn't work. Also I am not sure that after zipping the 2 list, I will be able to sort the resulting list or not.
674
Right-click on the file or folder. To place multiple files into a zip folder, select all of the files while hitting the Ctrl button. Then, right-click on one of the files, move your cursor over the “Send to” option and select “Compressed (zipped) folder”.
Python's zip() function is defined as zip(*iterables) . The function takes in iterables as arguments and returns an iterator. This iterator generates a series of tuples containing elements from each iterable. zip() can accept any type of iterable, such as files, lists, tuples, dictionaries, sets, and so on.
Array#zip() : zip() is a Array class method which Converts any arguments to arrays, then merges elements of self with corresponding elements from each argument. Return: merges elements of self with corresponding elements from each argument.
You are using zip() wrong; use it with the two lists:
zipped = zip(country_name, country_code)
You are applying it to each country name and country code individually:
>>> zip('South Africa', 'ZA')
[('S', 'Z'), ('o', 'A')]
zip() combines the two input sequences by pairing off each element; in strings, the individual characters are the elements of the sequence. Because there are only two characters in the country codes, you end up with lists of two elements, each a tuple of paired characters.
Once you combined both lists into a new one, you can most certainly sort that list, either on the first or second element:
>>> zip(country_name, country_code)
[('South Africa', 'ZA'), ('India', 'IN'), ('United States', 'US')]
>>> sorted(zip(country_name, country_code))
[('India', 'IN'), ('South Africa', 'ZA'), ('United States', 'US')]
>>> from operator import itemgetter
>>> sorted(zip(country_name, country_code), key=itemgetter(1))
[('India', 'IN'), ('United States', 'US'), ('South Africa', 'ZA')]
answer is in your question - use zip:
>>> country_name = ['South Africa', 'India', 'United States']
>>> country_code = ['ZA', 'IN', 'US']
>>> zip(country_name, country_code)
[('South Africa', 'ZA'), ('India', 'IN'), ('United States', 'US')]
If you have lists with different lengths, you could use itertools.izip_longest:
>>> from itertools import izip_longest
>>> country_name = ['South Africa', 'India', 'United States', 'Netherlands']
>>> country_code = ['ZA', 'IN', 'US']
>>> list(izip_longest(country_name, country_code))
[('South Africa', 'ZA'), ('India', 'IN'), ('United States', 'US'), ('Netherlands', None)]
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