TypeError: 'NoneType' Object Is Not Iterable In Python In Csv
I am new to python, and trying to create a program which opens a csv file. The user is supposed to enter a barcode , then the program finds that product and the cost of the product
Solution 1:
I have cleaned the flow up a bit for search_user_input
and quantity
. In some cases you were calling search_user_input
with multiple arguments (it doesn't accept them) and you made it recursive. I have added some comments in the code below. In fact, that function was returning None
in your setup, which leads to the TypeError: 'NoneType' object is not iterable
error.
The if __name__ == '__main__:'
is not necessary in your code, I've included it more as a heads-up for later on when you'll want to start importing your own modules. See this for more info on this topic.
import csv
def read_csv_file():
""" reads csv data and appends each row to list """
csv_data = []
with open("task2.csv") as csvfile:
spamreader = csv.reader(csvfile, delimiter=",", quotechar="|")
for row in spamreader:
csv_data.append(row)
return csv_data
def get_user_input():
""" get input from user """
while True:
try:
GTIN = int(input("input your gtin-8 number: "))
return GTIN # Breaks the loop and returns the value
except:
print ("Oops! That was not a valid number. Try again")
def search_user_input(product_data): # Pass the csv data as an argument
""" search csv data for string """
keep_searching = True
while keep_searching:
gtin = get_user_input()
for row in product_data:
if row[0] == str(gtin):
product = row[1]
price = round(float(row[2]),2)
return(product, price)
repeat = input("not in there? search again? If so (y), else press enter to continue")
if repeat != 'y':
keep_searching = False
return None # This is done implicitly, I'm just making it obvious
def quantity():
product_data = read_csv_file()
matches = search_user_input(product_data)
if matches: # Will not be True if search_user_input returned None
product, price = matches[0], matches[1]
order = int(input("How much of {} do you want?".format(product)))
price = round(price * order, 2)
print("That costs {}".format(price))
if __name__ == '__main__': # You'll need this in future for importing modules
# There was no need to read the csv_data here and make it global
quantity() # call the main function
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