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Python: Get a string made of the first 2 and the last 2 chars from a given a string

Python String: Exercise-3 with Solution

Write a Python program to get a string made of the first 2 and the last 2 chars from a given a string. If the string length is less than 2, return instead of the empty string.

Python String Exercises: Get a string made of the first 2 and the last 2 chars from a given a string

Sample Solution:-

Python Code:

def string_both_ends(str):
  if len(str) < 2:
    return ''

  return str[0:2] + str[-2:]

print(string_both_ends('w3resource'))
print(string_both_ends('w3'))
print(string_both_ends('w'))

Sample Output: 

w3ce                                                                                                          
w3w3

Flowchart:

Flowchart: Program to get a string made of the first 2 and the last 2 chars from a given a string

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Python Code Editor:

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Previous: Write a Python program to count the number of characters (character frequency) in a string.
Next: Write a Python program to get a string from a given string where all occurrences of its first char have been changed to '$', except the first char itself.

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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