AI-Learning

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

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

# empty.txt は存在しないファイル
try:
with open('empty.txt', 'r') as f:
print(f.read())
except FileNotFoundError as e:
print("File not found!")

# sample.txt
# ---
# Line1
# Line2
# ---
with open('sample.txt', 'r') as f:
for line in f:
print(line.strip())

items = [0, None, ""]
result = "リストに有効な要素があります" if any(items) else "有効な要素がありません"
print(result)

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

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

# ファイル名: sample.txt
with open('sample.txt', 'w') as f:
f.write("First Line\n")
f.flush()
f.write("Second Line\n")

$ python -m venv projectenv
$ source projectenv/bin/activate
$ pip install requests
$ pip list

items = [None, 0, "", False]
result = "有効な要素が含まれていません" if not any(items) else "有効な要素が含まれています"
print(result)

a, b = 0, -1
result = "条件を満たす" if a or b < 0 else "条件を満たさない"
print(result)

# ファイル名: sample.txt
# 初期内容:
# ---
# Line1
# Line2
# ---
with open('sample.txt', 'w') as f:
f.writelines(["New1\n", "New2\n", "New3\n"])

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

value = 123.456789
formatted = "{:.2f}".format(value)
print(formatted)

# sample.txt
# 初期内容: なし
try:
with open('sample.txt', 'x') as f:
f.write("New File Content")
f.write("\nSecond Line")
except FileExistsError:
print("File already exists")

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

# sample.txt
# ---
# Line1
# Line2
# ---
with open('sample.txt', 'r') as f:
lines = f.readlines()
print(len(lines))

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

# sample.txt
# ---
# Line1
# Line2
# Line3
# ---
with open('sample.txt', 'r') as f:
print(f.read(5))
print(f.read(5))

value = []
result = "空のリストです" if not value else "リストに値があります"
print(result)

# ファイル名: sample.txt
# 初期内容:
# ---
# Line1
# Line2
# ---
with open('sample.txt', 'r+') as f:
f.write("New")
f.seek(6)
f.write("Content")

# sample.txt
# ---
# Initial Line
# ---
with open('sample.txt', 'a+') as f:
f.write("\nAppended Line")
f.seek(0)
print(f.read())

data = None
result = "値がありません" if data is None else "値があります"
print(result)

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

$ python -m venv env
$ source env/bin/activate