合并两个列表以形成字典

Question

I have extracted the data I need from two columns of an excel sheet as two lists. When I try to combine these two lists into a dictionary, the final output has only 300 entries whereas my excel sheet has about 1200 entries. Why aren't all the entries being stored in the dictionary?

Here's my code:

import xlrd

xl_workbook = xlrd.open_workbook("my_doc.xls")
sheet1 = xl_workbook.sheet_by_index(0)

list1 = sheet1.col_values(2)
list2 = sheet1.col_values(3)

data = dict(zip(list1, list2))

I tried printing lengths of list1, list2, and data to cross-check.

Answer 1

Dictionaries can only contain unique keys. Check the length of set(list1) to see how many unique keys you have.