Read CSV File in Python — Python Technical Interview Questions & Answers

Read CSV File in Python

Read CSV File in Python

  • Read CSV File is about tabular files. csv is in the stdlib. Excel usually needs openpyxl or pandas. Always with open(...) so the file closes.
  • For Read CSV File read: csv.reader or DictReader (column names). Write: writer / DictWriter. Don’t load a 2 GB file into memory if you can stream rows.
  • Read CSV File on the board: one row name,marks → Asha,90. Print it back. Same idea for Excel cells.
  • Read CSV File in Python — output: Asha 90 then Ravi 85. DictReader uses column names — same as a real .csv file.
  with open(...) as f
         │ read / write
         ▼
      auto close

Technical Interview Tip: stdlib csv vs Excel library. One sentence + tiny row example.

Code Examples for Read CSV File in Python

Example

# Read CSV File in Python
import csv
from io import StringIO
text = "name,marks\nAsha,90\nRavi,85"
for row in csv.DictReader(StringIO(text)):
    print(row["name"], row["marks"])

Read CSV File in Python — output: Asha 90 then Ravi 85. DictReader uses column names — same as a real .csv file.

How to Explain Read CSV File in Python to an Interviewer

Explain Read CSV File as if you are teaching a junior — definition, then one tiny script.

Read CSV File reads or writes table files. Read CSV File — with open + csv/openpyxl.

What does the example print, and why?

Read CSV File in Python — output: Asha 90 then Ravi 85

What mistake do freshers make with Read CSV File?

Read CSV File — DictReader uses column names.