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+--- Thread: StopIteration error (/thread-7227.html)
StopIteration error - Rakesh - Dec-29-2017
Hi,
When i execute the below code getting "StopIteration" error:
import csv
import datetime
from pprint import pprint
def print_first_point(filename):
city = filename.split('-')[0].split('/')[-1]
print('\nCity: {}'.format(city))
with open(filename, 'r') as f_in:
trip_reader = csv.DictReader(f_in)
first_trip = trip_reader.__next__()
pprint(first_trip)
# output city name and first trip
return (city, first_trip)
# list of files for each city
data_files = ['./data/NYC-CitiBike-2016.csv',
'./data/Chicago-Divvy-2016.csv',
'./data/Washington-CapitalBikeshare-2016.csv',]
# print the first trip from each file, store in dictionary
example_trips = {}
for data_file in data_files:
city, first_trip = print_first_point(data_file)
example_trips[city] = first_tripError Information:StopIteration Traceback (most recent call last)
<ipython-input-84-840ef2f02bae> in <module>()
32 example_trips = {}
33 for data_file in data_files:
---> 34 city, first_trip = print_first_point(data_file)
35 example_trips[city] = first_trip
<ipython-input-84-840ef2f02bae> in print_first_point(filename)
16 ## first trip from the data file and store it in a variable. ##
17 ## see https://docs.python.org/3/library/csv.html#reader-objects ##
---> 18 first_trip = trip_reader.__next__()
19
20 ## TODO: Use the pprint library to print the first trip. ##
C:\ProgramData\Anaconda3\lib\csv.py in __next__(self)
110 # Used only for its side effect.
111 self.fieldnames
--> 112 row = next(self.reader)
113 self.line_num = self.reader.line_num
114
StopIteration:
RE: StopIteration error - squenson - Dec-29-2017
StopIteration is a normal error raised when the __next__() method is called but there are no more records to read. Therefore I guess that your file is empty.
RE: StopIteration error - buran - Dec-29-2017
also, you should not call
__next__() directly.Instead do
first_trip = next(trip_reader)