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Python: Add a prefix text to all of the lines in a string

Python String: Exercise-28 with Solution

Write a Python program to add a prefix text to all of the lines in a string.

Python String Exercises: Add a prefix text to all of the lines in a string

Sample Solution:-

Python Code:

import textwrap
sample_text ='''
    Python is a widely used high-level, general-purpose, interpreted,
    dynamic programming language. Its design philosophy emphasizes
    code readability, and its syntax allows programmers to express
    concepts in fewer lines of code than possible in languages such
    as C++ or Java.
    '''
text_without_Indentation = textwrap.dedent(sample_text)
wrapped = textwrap.fill(text_without_Indentation, width=50)
#wrapped += '\n\nSecond paragraph after a blank line.'
final_result = textwrap.indent(wrapped, '> ')
print()
print(final_result)
print()

Sample Output:

>  Python is a widely used high-level, general-                                                               
> purpose, interpreted, dynamic programming                                                                   
> language. Its design philosophy emphasizes code                                                             
> readability, and its syntax allows programmers to                                                           
> express concepts in fewer lines of code than                                                                
> possible in languages such as C++ or Java.

Flowchart:

Flowchart: Add a prefix text to all of the lines in a string

Python Code Editor:

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Python: Tips of the Day

Check if a given key already exists in a dictionary:

In is the intended way to test for the existence of a key in a dict.

d = {"key1": 10, "key2": 23}

if "key1" in d:
    print("this will execute")

if "nonexistent key" in d:
    print("this will not")

If you wanted a default, you can always use dict.get():

d = dict()

for i in range(100):
    key = i % 10
    d[key] = d.get(key, 0) + 1

and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:

from collections import defaultdict

d = defaultdict(int)

for i in range(100):
    d[i % 10] += 1

but in general, the in keyword is the best way to do it.

Ref: https://bit.ly/2XPMRyz