Python: Display an input string in upper and lower cases
Python String: Exercise-13 with Solution
Write a Python script that takes input from the user and displays that input back in upper and lower cases.

Sample Solution:-
Python Code:
user_input = input("What's your favourite language? ")
print("My favourite language is ", user_input.upper())
print("My favourite language is ", user_input.lower())
Sample Output:
What's your favourite language? english My favourite language is ENGLISH My favourite language is english
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Previous: Write a Python program to count the occurrences of each word in a given sentence.
Next: Write a Python program that accepts a comma separated sequence of words as input and prints the unique words in sorted form (alphanumerically).
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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
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