Функция longest word python

Python Program to Find Longest Word From Sentence or Text

In this program, first we read sentence from user then we use string split() function to convert it to list. After splitting it is passed to max() function with keyword argument key=len which returns longest word from sentence.

This Python program finds longest word from a given text or sentence.

Python Source Code: Longest Word

 # Longest word # Reading sentence from user sentence = input("Enter sentence: ") # Finding longest word longest = max(sentence.split(), key=len) # Displaying longest word print("Longest word is: ", longest) print("And its length is: ", len(longest)) 

Output

Enter sentence: Tongue tied and twisted just an earth bound misfit I Longest word is: twisted And its length is: 7

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Binary Study

In the program below, we read a string from user and find the longest word and it’s position in the string.

# Python program to read a String and Print Longest
# word and it's Position
# Read input string
str = input("Enter a String: ")
# Split the string to a list of words
word_list = str.split()
# Find the longest word
longest_word = max(word_list, key = len)
# Find the position (index) of longest word
pos = str.index(longest_word)
# Print the longest word and it's position
print("Longest word: ",longest_word)
print("Position of Longest word: ", pos)

Output

Enter a String: Binary Study Python programming made easy
Longest word: programming
Position of Longest word: 20

Program Explanation

We read the string from user using input() function. Assign the input string to str .

Then we create a list of words word_list using String split() method. The output of this method is a list. The string is split by the space.

Now we find max(word_list, key = len) function. It returns the longest element based on the length. Assign this to longest_word .

Now we apply String index() method passing longest_word as an argument . It returns the index of the first character of the longest_word . It is our desired position ( pos )of the longest word in the string. We could apply String find() method. It also returns the index of the first character of the passed sub string as parameter.

Finally print the longest word and it’s position.

Example (Using for Loop):

In the program below, the approach is same as the above. The only difference, we used for loop to find the longest words instead of using max() method.

str = input("Enter a String:")
words = str.split()
longest_word = words[0]
 
max_len = len(words[0])
for index, word in enumerate(words):
 
if len(word)> max_len:
 
max_len = len(word)
 
longest_word = word
 
else:
 
pass
idx = str.find(longest_word) # idx = str.index(longest_word)
print("Longest word: ",longest_word)
print("Position of Longest word: ", idx)

Enter a String: Binary Study Python programming made easy
Longest word: programming
Position of Longest word: 20

Notice the output of the two programs are the same. The second program is more naive in approach.

Methods and Functions Used

The following methods and functions are used in above two programs:

The input() Function

Here str is a string to show a default message before input.

It returns a string with value entered.

The String split() Method

str.split(separator, maxsplit)

Here separator specifies the separator to used, default is white space. The maxsplit specifies the number of split to do. Both the parameters are optional.

It returns a list. The words separated by white space are the list items.

>>> "Binary study programming made easy".split()
 ['Binary', 'study', 'programming', 'made', 'easy']

The max() Function

Here iterable can be any data type that is iterable such as list, tuple, dictionary, etc. The key is used to make comparison on that basis it returns the value. Here we used length ( len ) the basis of comparison.

>>> max(['Binary', 'study', 'programming', 'made', 'easy'], key = len)

'programming'

The String index() Method

Here substr is value to search for. As in our example substr is an individual word ( longest_word ).

It returns the index of first occurrence of the value of substr .

>>> "Binary study programming made easy".index('programming')
 13

The len() Function

Here object is a sequence or collection. A string is a sequence of characters.

It returns the number of items in the object . (It returns number of characters.)

The String find() Method

Same as the string index() method. The only difference is that it returns -1 if the match is not successful while the index() method throws an exception.

>>> "Binary study programming made easy".find('programming') 13

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Python File I/O: Find the longest words

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