Python每日一练（2025.4.14）

import osprint(os.path.exists("nonexistent.txt"))

with open("test.txt", "w") as f:    f.write("Hello")print(open("test.txt").read())

import jsonx = '{"name": "Alice"}'y = json.loads(x)print(isinstance(y, dict))

import rex = re.match(r"\d+", "123abc")print(x.group())