How To Get String Values From List In Python

In this Python tutorial, we will discuss different ways to get string values from a list in Python. And for this topic, let’s understand the following scenario

Table of Contents

How to get string values from list in Python: Scenario

Python excel sheets columns — Python Excel sheets columns

In this scenario, we have created a excel sheet which contains two columns Column A and column B. In these columns, there are two major attributes ‘Verbatim‘ and ‘Keyword’. In Verbatim(ColumnA) we have assigned some phrases) and other side we have selected some words in Keyword attribute.
First scenario: We have to find common words of ColumnB in Column A. For example suppose you have two given arrays the array1 is containing ‘verbatim‘ (column A) elements and the array2 elements contains ‘Keywords‘ elements. Now we have to find the common words between both the arrays
Second scenario: One word from column A must be attached with column B keywords.

There are various methods for finding the value of Column A in Column B. let’s have a look at the methods.

By using the regex method
By using Numpy method
By using for-loop method

By using NumPy method

In this Program, we will learn how to find the common values from input arrays by using the NumPy method.
To perform this particular task we are going to use the np.intersect1d() function. In Python, this function is used to find the intersection between two input arrays and this method takes two arrays as an argument and it will check the condition if the value of array 1 exists in array2 or not. In simple words, the intersection is defined as getting unique or common values from both the input arrays.

Syntax:

Here is the Syntax of Python np.intersect1d() function.

numpy.intersect1d
                 (
                  ar1,
                  ar2,
                  assume_unique=False,
                  return_indices=False
                 )

Example:

import numpy as np

x = np.array(['Books','open','doors','in','our','minds'])
y= np.array(['open','doors','minds'])

result = np.intersect1d(x,y)
print(result)

In the following given code we have imported the NumPy library and then created an array by using the np.array() function and within this function, we have assigned the string characters.

After creating an array we have declared a variable ‘result’ and used the np.intersect1d() function and within this function, we have assigned the input arrays as an argument.

Here is the implementation of the following given code.

How to find common values in NumPy Python

By using the regex method

In this section, we will learn how to get the string values from list by using the Python regex method.
In Python, the regex method is used for describing a search pattern in the given input text, and to create a regex object we are going to import the ‘re’ module.
After importing the module, we will use the re.search() method and within this function, we will assign the input text and this function will help the user to compile a regular expression and also search a pattern.

Example:

import re

input  = re.compile(r'(Books|teach|us|about|love|heartbreak)')
result = input.search('emotions heartbreak')
print('love and '+result.group())

In the above code, we have used the re.compile() method and this function takes input as a regular expression input and will check the same pattern inside the text. After that we have used the re.search() method and this method will help the user to find the occurrence of the pattern in the given string.

Here is the Screenshot of the following given code.

how to get string values from input text in Python

Read How to split a string using regex in python

By using for-loop method

In this section, we will learn how to find the value of Column A in Column B by using the for-loop method.

Example:

column_A = "A lesson for life from one lion to another"

column_B = ['lesson']

for i in column_B:

  if i in column_A:

    print(i)

In the above code we have created an input string ‘column_A’ along with that we created a list in which we have assigned the words which we want to operate with the input string.

In the given example, we have to find the value of column_B elements in column_A elements. To do this task we are going to use the for-loop method and iterate the values.

Here is the Output of the following given code.

How to get the common value in Python string

In this Python tutorial, we have learned how to get string values from a list in Python.