This tutorial will boost your programming skills by knowing how to convert String Cases in Pandas Using Python with examples.
Introduction
The strong ecosystem of data-centric Python packages makes Python an excellent language for data analysis. Pandas is one of these tools that simplify data import and analysis.
Python includes methods for converting a string to lower and upper cases. However, these approaches are inapplicable to lists and other multi-string objects.
Learn more about Python Strings through the Python String Tutorial.
What are pandas in python?
Pandas is a data analysis library that provides unique methods for translating each sequence value to its associated text case. “Series.str” must be included in lower, upper, and title Python keywords, Pandas series function calls.
How do you convert a string to a case in Python?
To convert a string to a case in Python, you can apply the islower() and isupper() functions.
isupper() is a built-in sequence technique in Python. This method returns true if every character in the string is uppercase, and false otherwise.
This function is used to determine whether or not the argument contains uppercase letters, such as:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Example 1
string = 'PYTHONFORFREE' print(string.isupper())
Output
True
Example 2
string = 'PythonForFree' print(string.isupper())
Output
False
islower() is a built-in sequence technique in Python. This method returns true if every character in the string is lowercase, and false otherwise.
This function is used to determine whether or not the argument contains uppercase letters, such as:
abcdefghijklmnopqrstuvwxyz
Example 1
string = 'PythonForFree' print(string.islower())
Output
False
Example 2
string = 'pythonforfree' print(string.islower())
Output
True
How do you change String to uppercase in Pandas?
When the character of each word (string) is lowercase or title, the upper() method in Pandas will transform it to uppercase.
In this example, the itsc[‘Names’] invokes the .upper() method, which converts all the data in ‘Names’ to upper case.
Example
import pandas as pd
data = {'Names': ['paul','prince','grace','gladys','caren']}
pff['Names'] = pff['Names'].str.upper()
print (pff)
Output
PAUL PRINCE GRACE GLADYS CAREN
Convert a String to Lowercase in Python Pandas
When the character of each word (string) is uppercase or title, the lower() method in Pandas will transform it to lowercase.
In this example, the ‘Names’ calls the .lower() function, so all values in the ‘Names’ data frame are converted to lowercase.
Example
import pandas as pd
data = {'Names': ['PAUL','PRINCE','GRACE','GLADYS','CAREN'] 'Age': [22,24,23,22,25]}
pff = pd.DataFrame(data, columns = ['Names', 'Age'])
pff['Names'] = pff['Names'].str.lower()
print (pff)
Output
Names Age paul 22 prince 24 grace 23 gladys 22 caren 25
How do you Change the first letter to Uppercase in Python Pandas?
capitalize() is used to capitalize string elements in the Panda series. In Python, a series is a sort of data structure that functions identically to a list. Similar to a list, a series can hold multiple sorts of data as they are entered.
Example
import pandas as pd
data = {'Names': ['paul','prince','grace','gladys','caren']}
pff['Names'] = pff['Names'].str.capitalize()
print (pff)
Output
Paul Prince Grace Gladys Care
The Python capitalize() function returns a copy of the original string and converts the string’s first character to an uppercase letter while converting the other characters to lowercase letters.
Convert String Values in Upper and Lower Cases using Python Pandas Series
As mentioned in the former examples, the upper() and lower() methods are used to convert strings in upper and lower cases.
In the case of Pandas Series in Python, .str.upper() is applicable for converting multiple strings in Python into upper case.
Example Program
import pandas as pd
import numpy as np
print("Pandas Series Uppercase:")
pff = pd.Series(['a', 'ab', 'abc'])
print(pff.str.upper())
Output
Pandas Series Uppercase: A AB ABC
On the other hand, .str.lower() is applicable for converting multiple strings in Python into lower case.
Example Program
import pandas as pd
import numpy as np
print("Pandas Series Lowercase:")
pff = pd.Series(['X', 'XY', 'XYZ'])
print(pff.str.lower())
Output
Pandas Series Lowercase: x xy xyz
Summary
In summary, learning how to convert string cases in Pandas is much more useful in Python programming. It is a one-dimensional data structure that can store text, integers, and even other Python objects.
The Pandas Series in Python is built using the Pandas constructor.
