Reading File Contents in Python

ToC

• Overview
• Preparing the File Used for Testing
• Reading the File Contents
• Reading Only the First Line of the File
• Reading the File Line by Line
• Reading the File and Parsing It as YAML

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Overview

This is a memo summarizing how to load the contents of a file in Python 3.

Preparing the File Used for Testing

cat <<EOF> sample.txt
greeting:
  ja: こんにちは
  en: hello

sports:
  ja: 相撲
  en: バスケット
EOF

Reading the File Contents

with open("sample.txt", "r") as file:
	d = file.read()

print(d)

greeting:
  ja: こんにちは
  en: hello

sports:
  ja: 相撲
  en: バスケット

Reading Only the First Line of the File

with open("sample.txt", "r") as file:
	d = file.readline()

print(d)

greeting:

Reading the File Line by Line

with open("sample.txt", "r") as file:
	d = file.readlines()

print(d)

['greeting:\n', '  ja: こんにちは\n', '  en: hello\n', '\n', 'sports:\n', '  ja: 相撲\n', '  en: バスケット\n']

Reading the File and Parsing It as YAML

pip install pyyaml

import yaml

with open("sample.txt", "r") as file:
    d = yaml.safe_load(file)

print(d)
print('---')
print(d['greeting']['ja'])

{'greeting': {'ja': 'こんにちは', 'en': 'hello'}, 'sports': {'ja': '相撲', 'en': 'バスケット'}}
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こんにちは

That’s all.
I hope you find this helpful.