﻿ Python: Takes a list of words and return the length of the longest one - w3resource # Python: Takes a list of words and returns the length of the longest one

## Python String: Exercise-8 with Solution

Write a Python function that takes a list of words and return the longest word and the length of the longest one. Sample Solution:-

Python Code:

``````def find_longest_word(words_list):
word_len = []
for n in words_list:
word_len.append((len(n), n))
word_len.sort()
return word_len[-1], word_len[-1]
result = find_longest_word(["PHP", "Exercises", "Backend"])
print("\nLongest word: ",result)
print("Length of the longest word: ",result)
```
```

Sample Output:

```Longest word:  Exercises
Length of the longest word:  9
```

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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