求教：Python列表索引超出范围

初学者!这是一个简单的代码!

import sys
from xlrd import open_workbook

input_file = sys.argv[1]

workbook = open_workbook(input_file)
print(‘Number of worksheets:’,workbook.nsheets)
for worksheet in workbook.sheets():
print(“worksheet name:”,worksheet.name,"\tRows:",
worksheet.nrows,"\tColums:",worksheet,ncols)

报错：input_file = sys.argv[1]
IndexError:List index out of range