Строковые индексы должны быть целыми числами, когда словарь находится в цикле

how to loop on the dictionary I am using python 3 latest version

string indices must be integers when dictionary in the loop



data analysis









from datetime import datetime as dt

# Takes a date as a string, and returns a Python datetime object.

# If there is no date given, returns None

def parse_date(date):

if date == '':

return None

else:

return dt.strptime(date, '%Y-%m-%d')

# Takes a string which is either an empty string or represents an integer,

# and returns an int or None.

def parse_maybe_int(i):

if i == '':

return None

else:

return int(i)

# Clean up the data types in the enrollments table

for enrollment in enrollments:

enrollment['cancel_date'] = parse_date(enrollment['cancel_date'])

enrollment['days_to_cancel'] = parse_maybe_int(enrollment['days_to_cancel'])

enrollment['is_canceled'] = enrollment['is_canceled'] == 'True'

enrollment['is_udacity'] = enrollment['is_udacity'] == 'True'

enrollment['join_date'] = parse_date(enrollment['join_date'])

enrollments[0]



here is error



TypeError Traceback (most recent call last)

<ipython-input-3-118808c6a8e0> in <module>

19 # Clean up the data types in the enrollments table

20 for enrollment in enrollments:

---> 21 enrollment['cancel_date'] = parse_date(enrollment['cancel_date'])

22 enrollment['days_to_cancel'] = parse_maybe_int(enrollment['days_to_cancel'])

23 enrollment['is_canceled'] = enrollment['is_canceled'] == 'True'

TypeError: string indices must be integers

TypeError: string indices must be integers