Count number of ROWS inside each COLUMN? package XLRD - python-3.x

Question

I started working with XLRD package for python 3.7.
I have a excel file that contains a fixed number of columns (20) but inside each column, the number of rows is changing (e.g.: first column has 21 rows, second column has 14 rows).
I wrote this:
for col in range(worksheet.ncols):
rows_number= worksheet.nrows
print(rows_number)
I'd like to know the number of rows for each column. With this code, I get 20 times (number of columns) the number of rows inside the first column. Actually I understand why. I'm iterating the nrows without changing the column.
How to get number of rows for all the columns?
If I try as follow, I get AttributeError since col doesn't have nrows attribute.
for col in range(worksheet.ncols):
rows_number= col.nrows
print(rows_number)
Thank you for your help!!

Answer 1

You can use list comprehension to get the non empty cells in a column, using col method in xlrd and comparing the Cell Type and then calculating its length
for colx in range(worksheet.ncols):
non_emptycells=[i for i,x in enumerate(sheet.col(colx)) if x.ctype is not 0]
print(len(non_emptycells))

Answer 2

You could use a nested while loop to work out the number of rows in each column
for c in range(worksheet.ncols):
counter = 0 # count of the rows
value = worksheet.cell(row=counter, col=c).value
while value != EMPTY:
counter += 1
row += 1
Replace the word EMPTY with a test to see if the cell is empty or not. You could then store this info in a dictionary for example once the while loop is done.