AI-Learning

# sample.txt
# ---
# Hello, World!
# ---
with open('sample.txt', 'r') as f:
print(f.read())

data = [None, False, 0]
result = "全ての要素が無効です" if not any(data) else "有効な要素があります"
print(result)

value = 12345
formatted = "{:,}".format(value)
print(formatted)

$ python -m venv myenv
$ source myenv/bin/activate
$ which python

value = 12345
formatted = "{:b}".format(value)
print(formatted)

# sample.txt
# ---
# Python Programming
# File Handling
# ---
with open('sample.txt', 'r') as f:
print(f.read(7))
print(f.readline())

# sample.txt
# ---
# Python is fun.
# Let's learn it!
# ---
with open('sample.txt', 'r') as f:
lines = f.???
print(lines)

value = 0.1234
formatted = "{:.2%}".format(value)
print(formatted)

# sample.txt の初期内容:
# ---
# Old Content
# ---
with open('sample.txt', 'w') as f:
f.write("New Content")

# ファイル名: sample.txt
# 初期内容: なし（ファイルは存在しない）
with open('sample.txt', 'a') as f:
f.write("Hello, World!")

username = None
result = "ユーザー名が設定されています" if username else "ユーザー名が設定されていません"
print(result)

# sample.txt
# ---
# Python is fun.
# File Handling is useful.
# ---
with open('sample.txt', 'r') as f:
print(f.readlines()[-1])

$ python -m venv env
$ source env/bin/activate
$ deactivate
$ rm -rf env
$ which python

a, b = None, 10
result = "値があります" if a or b > 5 else "値がありません"
print(result)

a, b = 10, 0
result = "実行されました" if a > 5 or b / 0 else "実行されませんでした"
print(result)

# sample.txt
# ---
# Hello, Python!
# Welcome to the world of programming.
# ---
with open('sample.txt', 'r') as f:
print(f.readline())

# sample.txt
# ---
# Python is amazing!
# ---
with open('sample.txt') as f:
print(f.read(6))

# ファイル名: sample.txt
with open('sample.txt', ???) as f:
f.write("Hello, World!")

$ python -m venv testenv
$ source testenv/bin/activate
$ pip list

name = ""
result = "名前が設定されています" if name else "名前が設定されていません"
print(result)

value = 1234
formatted = "{:08}".format(value)
print(formatted)

value = "Python"
formatted = "{:^10}".format(value)
print(formatted)

# ファイル名: sample.txt
with open('sample.txt', 'w') as f:
f.write("Line1\n")
f.write("Line2\n")
print(f.tell())

value = 255
formatted = "{:#o}".format(value)
print(formatted)

text = "Python"
result = "非空文字列です" if text else "空文字列です"
print(result)

n = 10
result = "偶数かつ5の倍数" if n % 2 == 0 and n % 5 == 0 else "条件を満たさない"
print(result)

a, b = 5, None
result = "成立" if a > 0 or b is not None else "不成立"
print(result)

# sample.txt
# ---
# Line1
# Line2
# ---
with open('sample.txt', 'r') as f:
print(f.tell())
f.read(5)
print(f.tell())

# empty.txt は空のファイル
with open('empty.txt', 'r') as f:
print(f.read())