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Saikrishna-52
Saikrishna-52

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Interesting Cool Python Tricks for working with Strings

#strings

one of the popular programming languages is python among many new and old programmers. It provides a easy to read and a pseudo-code format of program. This helps in easy understanding of the overall program structure and algorithm.
There are many ways in, which a particular python logic can be written. Below are some of the cool Python program tricks, which might help you to work with strings. Use the below tricks and get your logic working easier.

Strings

Let us see the different operations that can be performed on the below string.

 word = 'Sample' len(word) Output 6 +---+---+---+---+---+---+ | S | a | m | p | l | e | +---+---+---+---+---+---+ 0 1 2 3 4 5 6 -6 -5 -4 -3 -2 -1
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1 Concatenation

Join a string with another
string 

 word = 'Sample' word + ' ' + 'trick' Output 'Sample trick'
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2 Indexed Access of Strings

A string in a python can be
indexed to perform operations on the string

 Positive single character word = 'Sample' word[3] Output p Negative single character word = 'Sample' word[-2] Output l String Reverse word = 'Sample' word[::-1] Output 'elpmaS' Reverse string by iterating through string contents word = 'Sample' for char in reversed(word): print(char) Output e l p m a S
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3 Slicing of Strings

Slicing allows us to access a substring of characters from a word.

 Example 1 word = 'Sample' word[0:3] Output Sam Example 2 word = 'Sample' word[4:5] Output le Example 3 word = 'Sample' word[:5] Output Sampl
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4 Remove leading and trailing characters

To remove space before and after a string the strip() method can be used has shown below

 ' Sample '.strip() Output Sample 'sample'.strip('ple') Output Sam
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5 Left fill with ASCII ‘0’

To left fill with ASCII ‘0’’, we can use zfill() method to make a length of required string width.

 "10".zfill(6) Output 000010 "-10".zfill(6) Output -00010
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6 Find Substring

The find() method can be used to extract a substring from a string

 'sample'.find('am',0,5) Output 1 'sam' in 'sample' Output True
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7 Find if the string contains Numbers

The isalpha() method can be used to find if a string contains number

 '123'.isalpha() Output False 'abc'.isalpha() Output True '1abc'.isalpha() Output False
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#8 Find if the string is alphanumeric

The isalnum() method can be used to find if the string contains alphanumeric and at least one character

 ' '.isalnum() Output False 'abc'.isalnum() Output True
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9 Find if the string is having only whitespace

The isspace() method can be used to determine if the string is only whitespace character

 ' '.isspace() Output True 'Sample '.isspace() Output False
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10 Remove Spaces on the left side of the string

The lstrip() can be used to remove whitespace characters on the left.

' sample '.lstrip() Output 'spacious ' ss'www.example.com'.lstrip('cmowz.') Output 'example.com'
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Remove Spaces on the right side of the string

The rstrip() can be used to remove whitespace characters on the left.

 ' sample '.rstrip() Output 'spacious ' 'mississippi'.rstrip('ipz') Output 'mississ'
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12 Formatted String Literals

The string literals which are prefixed with ‘f’ or ’F’ are called f-string.

word = "Sample" f"THis is a {word!r} string." Output "THis is a 'Sample' string."
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13 Joining multiple strings from a list

The join() method can be used to join the strings in a list

 Test = ["This","is","Sample"] print(" ".join(Test)) Output This is Sample
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14.Repeat string multiple times

Same like nos the strings can be multiplied to generate multiple string

 word = "Sample" print(word*3) Output SampleSampleSample
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15.Splitting a sentence to word

The split() method can be used to split a sentence to multiple words to form a list

 "This is a Sample".split() Output ['This', 'is', 'a', 'Sample']
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16.Find the frequent word in a sentence

The word which occurs most times in a sentence can be found using the below trick

sentence = “She was young the way an actual young person is young”.split() most_frequent_word = max(set(sentence),key=sentence.count) Output 'young'
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Remove duplicate words in a sentence
Duplicate words in a sentence can be removed has shown below

 sentence = "The sound sounds sound".split() list(set(sentence)) Output ['sound', 'The', 'sounds']
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Remove duplicate words retain the sentence order

The below trick removes the duplicate word keeping the order of words in the sentence.
from collections import OrderedDict

sentence = "The sound sounds sound".split()
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list(OrderedDict.fromkeys(sentence).keys())

 Output ['The', 'sound', 'sounds']
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Reversing a sentence

The reverse() method can be used to reverse a sentence

sentence = "This is Sample".split() sentence.reverse() print(sentence) Output ['Sample', 'is', 'This']
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Combine list using zip() method

The zip() method can be used to combine two seperate list of strings.

 Name = ['Tom', 'Marry', 'Jon'] Age = ['35', '30', '40'] for Name, Age in zip(Name,Age): print(Name,Age) Output Tom 35 Marry 30 Jon 40
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