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Python: Get the last part of a string before a specified character

Python String: Exercise-19 with Solution

Write a Python program to get the last part of a string before a specified character.

Python String Exercises: Get the last part of a string before a specified character

Sample Solution:-

Python Code:

str1 = 'https://www.w3resource.com/python-exercises/string'
print(str1.rsplit('/', 1)[0])
print(str1.rsplit('-', 1)[0])

Sample Output:

https://www.w3resource.com/python-exercises                                                                    
https://www.w3resource.com/python               

Flowchart:

Flowchart: Get the last part of a string before a specified character

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Python Code Editor:

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Previous: Write a Python function to get a string made of its first three characters of a specified string. If the length of the string is less than 3 then return the original string.
Next: Write a Python function to reverse a string if it's length is a multiple of 4.

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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