问题
I have written a program that randomly generates a series of 5 letters (ASCII, both upper and lower case) in column 1 of a csv and 4 numbers (0-9) in column 2 of a csv and saves them as a file. I can sort column 2 in order of ascending values but struggle with the column 1 as it sorts all the upper case values first and then lower case. this is also output to a new file ('sorted.csv')
example:
ANcPI
DLBvA
FpSCo
beMhy
dWDjl
does anyone know how to sort these so that upper or lower case does not impact but rather just the letter? It should sort as:
ANcPI
beMhy
DLBvA
dWDjl
FpSCo
回答1:
I ran into this recently as well, and it - assuming your data is in a list - can be solved very simply by specifying the optional key argument:
li = ['ANcPI', 'DLBvA', 'FpSCo', 'beMhy', 'dWDjl']
li.sort(key=lambda m : m.lower())
Then,
>>>print(li)
['ANcPI', 'beMhy', 'DLBvA', 'dWDjl', 'FpSCo']
来源：https://stackoverflow.com/questions/34683129/how-to-deal-with-case-sensitive-sorting-for-output-files