Python -Top 4 Realtime interview Questions and Solutions

Python beginners /Experienced interview questions update 2020
What is docstring in Python?
 Documentation string or docstring is a multiline string used to document a specific code segment.
 The docstring should describe what the function or method does.

Declaring Docstrings: The docstrings are declared using ”’triple single quotes”’ or “””triple double quotes””” just below the class, method or function declaration. All functions should have a docstring.


Ex:

def my_function():
'''Demonstrates triple double quotes
docstrings and does nothing really.'''

return None

print("Using __doc__:")
print(my_function.__doc__)

print("Using help:")
help(my_function)


def power(a, b):
"""Returns arg1 raised to power arg2."""

return a**b

print(power.__doc__)

Explain how to delete a file in Python?
 Use command os.remove(file_name)
import os
os.remove("c:\downloads\ChangedFile.csv")
print("File Removed!")



What is slicing in Python?
 As the name suggests, ‘slicing’ is taking parts of.
 Syntax for slicing is [start : stop : step]
 start is the starting index from where to slice a list or tuple
 stop is the ending index or where to stop.
 step is the number of steps to jump.
 Default value for start is 0, stop is number of items, step is 1.
 Slicing can be done on strings, arrays, lists, and tuples.
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
print(numbers[1 : : 2]) #output : [2, 4, 6, 8, 10]




Q ) What does ‘#’ symbol do in Python?
Answer: ‘#’ is used to comment out everything that comes after on the line.
Example:
print (“I am a beginner in Python”)
#print (“I am a beginner in Python”)
Output:
I am a beginner in Python