f = open("temp.txt", "w")print(f.closed)f.close()print(f.closed) with open("temp.txt") as g:    print("inside with:", g.closed)print("after with:", g.closed)

False
True
inside with: False
after with: True

data = (12, 45, 78)with open("tuple.txt", "w") as f:    f.write("\n".join(map(str, data))) with open("tuple.txt") as f:    loaded = tuple(int(line) for line in f)print(loaded, loaded == data)

(12, 45, 78) True

import os with open("data.bin", "wb") as f:    f.write(b"x" * 1500) print(os.path.getsize("data.bin"), "bytes")

1500 bytes

with open("story.txt", "w") as f:    f.write("a\nb\nc\nd\n") with open("story.txt") as f:    print(sum(1 for _ in f))

4

import difflibimport filecmp with open("a.txt", "w") as f:    f.write("line one\nline two\nline three\n")with open("b.txt", "w") as f:    f.write("line one\nline 2\nline three\n") print("Same:", filecmp.cmp("a.txt", "b.txt", shallow=False))with open("a.txt") as a, open("b.txt") as b:    for line in difflib.unified_diff(a.readlines(), b.readlines(), "a.txt", "b.txt", n=0):        print(line.rstrip("\n"))

Same: False
--- a.txt
+++ b.txt
@@ -2 +2 @@
-line two
+line 2

import re with open("contacts.txt", "w") as f:    f.write("Asha 9876543210\nRavi 12345\nMeena 9123456780 and 99887766554\n") with open("contacts.txt") as f:    print(re.findall(r"\b\d{10}\b", f.read()))

['9876543210', '9123456780']

with open("story.txt", "w") as f:    f.write("Python files make testing simple\n") with open("story.txt") as f:    words = f.read().split()print("Even:", [w for w in words if len(w) % 2 == 0])print("Odd:", [w for w in words if len(w) % 2 == 1])

Even: ['Python', 'make', 'simple']
Odd: ['files', 'testing']

import osimport string os.makedirs("letters", exist_ok=True)for letter in string.ascii_uppercase:    with open(os.path.join("letters", f"{letter}.txt"), "w") as f:        f.write(f"This is file {letter}\n") files = sorted(os.listdir("letters"))print(len(files), files[:3], files[-1])

26 ['A.txt', 'B.txt', 'C.txt'] Z.txt

with open("story.txt", "w") as f:    f.write("Python is fun\nFiles are easy to read\n") with open("story.txt") as f:    print(sum(len(line.split()) for line in f))

8

with open("in.txt", "w") as f:    f.write("Hello World\nPython Files\n") with open("in.txt") as src, open("upper.txt", "w") as dst:    for line in src:        dst.write(line.upper())print(open("upper.txt").read())

HELLO WORLD
PYTHON FILES