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Discover powerful insights with Python, Machine Learning, Coding, and Rβ€”your essential toolkit for data-driven solutions, smart alg

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python-docx: Create and Modify Word Documents #python

python-docx is a Python library for reading, creating, and updating Microsoft Word 2007+ (.docx) files.

Installation
pip install python-docx

Example
from docx import Document

document = Document()
document.add_paragraph("It was a dark and stormy night.")
<docx.text.paragraph.Paragraph object at 0x10f19e760>
document.save("dark-and-stormy.docx")

document = Document("dark-and-stormy.docx")
document.paragraphs[0].text
'It was a dark and stormy night.'

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1. What is the output of the following code?
x = [1, 2, 3]
y = x
y[0] = 4
print(x)

2. Which of the following is NOT a valid way to create a dictionary in Python?
A) dict(a=1, b=2)
B) {a: 1, b: 2}
C) dict([('a', 1), ('b', 2)])
D) {1: 'a', 2: 'b'}

3. Write a function that takes a list of integers and returns a new list containing only even numbers.

4. What will be printed by this code?
def func(a, b=[]):
b.append(a)
return b
print(func(1))
print(func(2))

5. What is the purpose of the __slots__ attribute in a Python class?

6. Which built-in function can be used to remove duplicates from a list while preserving order?

7. Explain the difference between map(), filter(), and reduce() with examples.

8. What does the @staticmethod decorator do in Python?

9. Write a generator function that yields Fibonacci numbers up to a given limit.

10. What is the output of this code?
import copy
a = [1, 2, [3, 4]]
b = copy.deepcopy(a)
b[2][0] = 5
print(a[2][0])

11. Which of the following is true about Python’s GIL (Global Interpreter Lock)?
A) It allows multiple threads to execute Python bytecode simultaneously.
B) It prevents race conditions in multithreaded programs.
C) It limits CPU-bound multi-threaded performance.
D) It is disabled in PyPy.

12. How would you implement a context manager using a class?

13. What is the result of bool([]) and why?

14. Write a recursive function to calculate the factorial of a number.

15. What is the difference between is and == in Python?

16. Explain how Python handles memory management for objects.

17. What is the output of this code?
class A:
def __init__(self):
self.x = 1

class B(A):
def __init__(self):
super().__init__()
self.y = 2

obj = B()
print(hasattr(obj, 'x') and hasattr(obj, 'y'))

18. Describe the use of *args and **kwargs in function definitions.

19. Write a program that reads a text file and counts the frequency of each word.

20. What is monkey patching in Python and when might it be useful?

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By: @DataScienceQ πŸš€
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Python Notes.pdf
405.6 KB
Python Notes 🌟🌟🌟🌟🌟

#python

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==================================
🧠 By: https://t.iss.one/DataScienceM
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In Python, enhanced for loops with enumerate() provide both the index and value of items in an iterable, making it ideal for tasks needing positional awareness without manual counters. This is more Pythonic and efficient than using range(len()) for list traversals.

fruits = ['apple', 'banana', 'cherry']
for index, fruit in enumerate(fruits):
print(f"{index}: {fruit}")

# Output:
# 0: apple
# 1: banana
# 2: cherry

# With start offset:
for index, fruit in enumerate(fruits, start=1):
print(f"{index}: {fruit}")
# 1: apple
# 2: banana
# 3: cherry


#python #forloops #enumerate #bestpractices

βœ‰οΈ @DataScience4
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In Python, lists are versatile mutable sequences with built-in methods for adding, removing, searching, sorting, and moreβ€”covering all common scenarios like dynamic data manipulation, queues, or stacks. Below is a complete breakdown of all list methods, each with syntax, an example, and output, plus key built-in functions for comprehensive use.

πŸ“š Adding Elements
⦁ append(x): Adds a single element to the end.

  lst = [1, 2]
lst.append(3)
print(lst) # Output: [1, 2, 3]


⦁ extend(iterable): Adds all elements from an iterable to the end.

  lst = [1, 2]
lst.extend([3, 4])
print(lst) # Output: [1, 2, 3, 4]


⦁ insert(i, x): Inserts x at index i (shifts elements right).

  lst = [1, 3]
lst.insert(1, 2)
print(lst) # Output: [1, 2, 3]


πŸ“š Removing Elements
⦁ remove(x): Removes the first occurrence of x (raises ValueError if not found).

  lst = [1, 2, 2]
lst.remove(2)
print(lst) # Output: [1, 2]


⦁ pop(i=-1): Removes and returns the element at index i (default: last).

  lst = [1, 2, 3]
item = lst.pop(1)
print(item, lst) # Output: 2 [1, 3]


⦁ clear(): Removes all elements.

  lst = [1, 2, 3]
lst.clear()
print(lst) # Output: []


πŸ“š Searching and Counting
⦁ count(x): Returns the number of occurrences of x.

  lst = [1, 2, 2, 3]
print(lst.count(2)) # Output: 2


⦁ index(x[, start[, end]]): Returns the lowest index of x in the slice (raises ValueError if not found).

  lst = [1, 2, 3, 2]
print(lst.index(2)) # Output: 1


πŸ“š Ordering and Copying
⦁ sort(key=None, reverse=False): Sorts the list in place (ascending by default; stable sort).

  lst = [3, 1, 2]
lst.sort()
print(lst) # Output: [1, 2, 3]


⦁ reverse(): Reverses the elements in place.

  lst = [1, 2, 3]
lst.reverse()
print(lst) # Output: [3, 2, 1]


⦁ copy(): Returns a shallow copy of the list.

  lst = [1, 2]
new_lst = lst.copy()
print(new_lst) # Output: [1, 2]


πŸ“š Built-in Functions for Lists (Common Cases)
⦁ len(lst): Returns the number of elements.

  lst = [1, 2, 3]
print(len(lst)) # Output: 3


⦁ min(lst): Returns the smallest element (raises ValueError if empty).

  lst = [3, 1, 2]
print(min(lst)) # Output: 1


⦁ max(lst): Returns the largest element.

  lst = [3, 1, 2]
print(max(lst)) # Output: 3


⦁ sum(lst[, start=0]): Sums the elements (start adds an offset).

  lst = [1, 2, 3]
print(sum(lst)) # Output: 6


⦁ sorted(lst, key=None, reverse=False): Returns a new sorted list (non-destructive).

  lst = [3, 1, 2]
print(sorted(lst)) # Output: [1, 2, 3]


These cover all standard operations (O(1) for append/pop from end, O(n) for most others). Use slicing lst[start:end:step] for advanced extraction, like lst[1:3] outputs ``.

#python #lists #datastructures #methods #examples #programming

⭐ @DataScience4
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