csv python write

1# This action requires the 'csv' module
2import csv
3
4# The basic usage is to first define the rows of the csv file:
5row_list = [["SN", "Name", "Contribution"],
6             [1, "Linus Torvalds", "Linux Kernel"],
7             [2, "Tim Berners-Lee", "World Wide Web"],
8             [3, "Guido van Rossum", "Python Programming"]]
9
10# And then use the following to create the csv file:
11with open('protagonist.csv', 'w', newline='') as file:
12    writer = csv.writer(file)
13    writer.writerows(row_list)
14# This will create a csv file in the current directory

1import csv
2
3with open('names.csv', 'w') as csvfile:
4    fieldnames = ['first_name', 'last_name']
5    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
6
7    writer.writeheader()
8    writer.writerow({'first_name': 'Baked', 'last_name': 'Beans'})
9    writer.writerow({'first_name': 'Lovely', 'last_name': 'Spam'})
10    writer.writerow({'first_name': 'Wonderful', 'last_name': 'Spam'})
11

1with open(r'c:\dl\FrameRecentSessions.csv') as csv_file:
2    csv_reader = csv.reader(csv_file, delimiter=',')
3    line_count = 0
4    for row in csv_reader:
5        if line_count == 0:
6            print(f'Column names are {", ".join(row)}')
7            line_count += 1
8        else:
9            print(f'\t{row[0]} works in the {row[1]} department, and was born in {row[2]}.')
10            line_count += 1
11    print(f'Processed {line_count} lines.')

1import numpy as np
2np.savetxt('data.csv', (col1_array, col2_array, col3_array), delimiter=',')

1>>> import csv
2>>> with open('eggs.csv', newline='') as csvfile:
3...     spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
4...     for row in spamreader:
5...         print(', '.join(row))
6Spam, Spam, Spam, Spam, Spam, Baked Beans
7Spam, Lovely Spam, Wonderful Spam
8