Why isn't isalpha working?

Question

Python

I am reading data from an excel file through openpyxl , in cell E18 the line "transition" is written:

from openpyxl import load_workbook

wb = load_workbook(filename='data.xlsx', read_only=True)
ws = wb.active
data = ws['E18'].value
print(data.isalpha())

Prints False - why?

Answer 1

>>> 'переход'.isalpha()
False
>>> u'переход'.isalpha()
True
>>> unicode('переход', 'utf-8').isalpha()
True
>>>