How to process csv files
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This document discusses how to process CSV files in Python. It begins by explaining why Python is a useful language, then describes what CSV files are and where they come from. It explains that the csv library in Python allows reading from and writing to CSV files. It provides sample code to read a CSV file containing employee data and print out the information, as well as code to write new employee data to a CSV file.
![Here’s code to read it:
import csv
with open('employee_birthday.txt') as csv_file:
csv_reader = csv.reader(csv_file , delimiter=',')
line_count = 0
for row in csv_reader:
if line_count == 0:
print(f'Column names are {", ".join(row)}')
line_count += 1
else:
print(f't{row[0]} works in the {row[1]} department, and was born in
{row[2]}.')
line_count += 1
print(f'Processed {line_count} lines.')](https://image.slidesharecdn.com/howtoprocesscsvfiles-181226045125/85/How-to-process-csv-files-8-320.jpg)
![Writing CSV Files With csv
import csv
with open('employee_file.csv', mode='w') as employee_file:
employee_writer = csv.writer(employee_file , delimiter=',',
quotechar='"', quoting=csv.QUOTE_MINIMAL)
employee_writer.writerow(['John Smith', 'Accounting',
'November'])
employee_writer.writerow(['Erica Meyers', 'IT', 'March'])](https://image.slidesharecdn.com/howtoprocesscsvfiles-181226045125/85/How-to-process-csv-files-9-320.jpg)
How to process csv files
- 1. How to process CSV file in Python? By Tukaram Bhagat
- 2. Why Learn Python? • Python is a general-purpose, versatile and popular programming language. It's great as a first language because it is concise and easy to read, and it is also a good language to have in any programmer's stack as it can be used for everything from web development to software development and data science applications.
- 3. Take-Away Skills • This course is a great introduction to both fundamental programming concepts and the Python programming language. Python 3 is the most up-to-date version of the language with many improvements made to increase the efficiency and simplicity of the code that you write.
- 4. What Is a CSV File? A CSV file (Comma Separated Values file) is a plain text file that uses specific structuring to arrange tabular data. It can contain only actual text printable ASCII or Unicode characters.
- 5. Where Do CSV Files Come From? • CSV files are normally created by programs that handle large amounts of data. • They are a convenient way to export data from spreadsheets and databases as well as import or use it in other programs.
- 6. Parsing CSV Files With Python’s Built- in CSV Library • The csv library provides functionality to both read from and write to CSV files. • The csv library contains objects and other code to read, write, and process data from and to CSV files.
- 7. Reading CSV Files With csv Here’s the employee_birthday.txt file: Name,Department,Birthday Month John Smith,Accounting,November Erica Meyers,IT,March
- 8. Here’s code to read it: import csv with open('employee_birthday.txt') as csv_file: csv_reader = csv.reader(csv_file , delimiter=',') line_count = 0 for row in csv_reader: if line_count == 0: print(f'Column names are {", ".join(row)}') line_count += 1 else: print(f't{row[0]} works in the {row[1]} department, and was born in {row[2]}.') line_count += 1 print(f'Processed {line_count} lines.')
- 9. Writing CSV Files With csv import csv with open('employee_file.csv', mode='w') as employee_file: employee_writer = csv.writer(employee_file , delimiter=',', quotechar='"', quoting=csv.QUOTE_MINIMAL) employee_writer.writerow(['John Smith', 'Accounting', 'November']) employee_writer.writerow(['Erica Meyers', 'IT', 'March'])