Q141. What does len() do?
The built-in **`len()`** function returns the number of items (cardinality) in an object: ```python len("Python") # 6 (number of characters) len([1, 2, 3, 4, 5]) # 5 (num...
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Q142. Explain split(), sub(), subn() methods of "re" module in Python.
To modify the strings, Python's "re" module is providing 3 methods. They are: split() – uses a regex pattern to "split" a given string into a list. sub() – finds all subs...
Q143. What are negative indexes and why are they used?
The sequences in Python are indexed and it consists of the positive as well as negative numbers. The numbers that are positive uses '0' that is uses as first index and '1...
Q144. What are Python packages?
A **Python package** is a folder containing modules and typically an `__init__.py` file. Packages organize modules into a hierarchical dot-separated namespace (e.g., `url...
Q145. How can files be deleted in Python?
To delete a file in Python, you need to import the OS Module. After that, you need to use the os.remove() function. Example: 1 2 ```python import os ``` os.remove("xyz.tx...
Q146. What are the built-in types of Python?
Python provides a comprehensive set of built-in data types organized into distinct structural families: ### 1. Numeric Types: - `int`: Unlimited-precision integers. - `fl...
Q147. What advantages do NumPy arrays offer over (nested) Python lists?
Python's lists are efficient general-purpose containers. They support (fairly) efficient insertion, deletion, appending, and concatenation, and Python's list comprehensio...
Q148. How to add values to a Python array?
Elements can be added to an array using the append(), extend() and the insert (i,x) functions. Example: a=arr.array('d', [1.1 , 2.1 ,3.1] ) a.append(3.4) print(a) a.exten...
Q149. How to remove values to a Python array?
Array elements can be removed using pop() or remove() method. The difference between these two functions is that the former return s the deleted value whereas the latter ...
Q150. Does Python have OOP concepts?
Python is an object-oriented programming language. This means that any program can be solved in python by creating an object model. However, Python can be treated as proc...