List of strings in python

Question

I have a csv file which has a column of dates and I m importing that using the below code.

Problem is when i map that to a list of strings, it is printed as below.

["['05/06/2020']", "['1/6/2020']", "['5/22/2020']"]

With this I'm unable to check if the list contains my value(eg: another date) after doing necessary formatting.

I would like this to be

['05/06/2020', '1/6/2020', '5/22/2020']

with open('holidays.csv','r') as csv_file:
    csv_Reader = csv.reader(csv_file)
    next(csv_Reader)
    listDates = list(map(str,csv_Reader))

    print(listDates)

What is in the actual file? listDates = list(csv_Reader) would seem to be sufficient. — chepner
– chepner, Commented Jun 13, 2020 at 15:33
It has a single column of dates. Yes, I tried your line of code before using the map(str,)... But it returned me list of lists which i don't want as I had little difficulty checking whether the date inputted by the user is available in the list. — sudhakar
– sudhakar, Commented Jun 13, 2020 at 15:40

Sahith Kurapati · Accepted Answer · 2020-06-13 15:27:04Z

3

You can just simply add one extra line like so:

with open('holidays.csv','r') as csv_file:
    csv_Reader = csv.reader(csv_file)
    next(csv_Reader)
    listDates = list(map(str,csv_Reader))
    listDates = [x.split("'")[1] for x in listDates]

    print(listDates)

Hope this helps :)

answered Jun 13, 2020 at 15:27

Sahith Kurapati

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Comments

Austin · Accepted Answer · 2020-06-13 15:25:30Z

0

Use ast.literal_eval in a list comprehension to evaluate individual elements and capture the first entry:

import ast

lst = ["['05/06/2020']", "['1/6/2020']", "['5/22/2020']"]

res = [ast.literal_eval(x)[0] for x in lst]
# ['05/06/2020', '1/6/2020', '5/22/2020']

answered Jun 13, 2020 at 15:25

Austin

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Comments

Red · Accepted Answer · 2020-06-13 15:31:42Z

0

Like this:

l = ["['05/06/2020']", "['1/6/2020']", "['5/22/2020']"]
l = [s[2:-2] for s in l]
print(l)

Output:

['05/06/2020', '1/6/2020', '5/22/2020']

answered Jun 13, 2020 at 15:31

Red

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Comments

chepner · Accepted Answer · 2020-06-13 16:13:52Z

0

If your file looks like this

05/06/2020
01/06/2020
05/22/2020

all you need is

with open('holidays.csv','r') as csv_file:
    csv_Reader = csv.reader(csv_file)
    next(csv_Reader)
    listDates = [row[0] for row in csv_Reader]

Each row will be a list of fields, even if there is only one field.

answered Jun 13, 2020 at 16:13

chepner

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