পাইথন চিটশিট

print("হ্যালো, পাইথন!")

x = 5
name = "পাইথন"
items = [1, "দুই", 3]
print(x, name, items)  # 5 পাইথন [1, 'দুই', 3]

a = 10
b = 3
print(a + b)  # 13
print(a // b)  # 3 (ভাগফল)
print(a > b and b > 0)  # True

x = 10
if x > 0:
    print("ধনাত্মক")
elif x == 0:
    print("শূন্য")
else:
    print("ঋণাত্মক")

for i in range(1, 4):
    print(i)  # 1, 2, 3
 
x = 5
while x > 0:
    print(x)
    x -= 1  # 5, 4, 3, 2, 1

def greet(name):
    return f"হ্যালো, {name}!"
print(greet("রহিম"))  # হ্যালো, রহিম!
 
# ডিফল্ট প্যারামিটার
def add(a, b=5):
    return a + b
print(add(3))  # 8

double = lambda x: x * 2
print(double(4))  # 8

numbers = [3, 1, 4]
numbers.append(2)
numbers.sort()
print(numbers)  # [1, 2, 3, 4]

person = {"name": "করিম", "age": 30}
print(person["name"])  # করিম
person["city"] = "ঢাকা"
print(person)  # {'name': 'করিম', 'age': 30, 'city': 'ঢাকা'}

unique = {1, 2, 2, 3}
print(unique)  # {1, 2, 3}
unique.add(4)
print(unique)  # {1, 2, 3, 4}

text = "পাইথন শিখছি"
print(text.split())  # ['পাইথন', 'শিখছি']

# লেখা
with open("file.txt", "w") as f:
    f.write("হ্যালো, পাইথন!")
 
# পড়া
with open("file.txt", "r") as f:
    content = f.read()
    print(content)  # হ্যালো, পাইথন!

class Person:
    def __init__(self, name):
        self.name = name
    
    def greet(self):
        return f"হ্যালো, আমি {self.name}"
 
p = Person("রহিম")
print(p.greet())  # হ্যালো, আমি রহিম

class Student(Person):
    def study(self):
        return f"{self.name} পড়ছে"
 
s = Student("করিম")
print(s.greet())  # হ্যালো, আমি করিম
print(s.study())  # করিম পড়ছে

try:
    x = 10 / 0
except ZeroDivisionError:
    print("শূন্য দিয়ে ভাগ করা যায় না!")
finally:
    print("শেষ")

squares = [x**2 for x in range(5)]
print(squares)  # [0, 1, 4, 9, 16]

# math মডিউল
import math
print(math.sqrt(16))  # 4.0
 
# কাস্টম মডিউল
# mymodule.py
def say_hi():
    return "হাই!"
# main.py
from mymodule import say_hi
print(say_hi())  # হাই!

import numpy as np
arr = np.array([1, 2, 3])
print(arr * 2)  # [2 4 6]

import pandas as pd
data = {"name": ["রহিম", "করিম"], "age": [25, 30]}
df = pd.DataFrame(data)
print(df)
#    name  age
# 0  রহিম   25
# 1  করিম   30

nums = [1, 2, 3]
doubled = list(map(lambda x: x*2, nums))
print(doubled)  # [2, 4, 6]

import asyncio
 
async def say_hello():
    await asyncio.sleep(1)
    print("হ্যালো!")
 
asyncio.run(say_hello())

class Calculator:
    def add(self, a, b):
        return a + b
 
calc = Calculator()
numbers = [1, 2, 3, 4, 5]
 
try:
    total = sum(numbers)
    result = calc.add(total, 10)
    print(f"মোট: {result}")
except Exception as e:
    print(f"এরর: {e}")
finally:
    print("কাজ শেষ!")
# মোট: 25
# কাজ শেষ!