Pandas: Extract only punctuations from the specified column of a given DataFrame
Pandas: String and Regular Expression Exercise-31 with Solution
Write a Pandas program to extract only punctuations from the specified column of a given DataFrame.
Sample Solution:
Python Code :
import pandas as pd
import re as re
pd.set_option('display.max_columns', 10)
df = pd.DataFrame({
'company_code': ['c0001.','c000,2','c0003', 'c0003#', 'c0004,'],
'year': ['year 1800','year 1700','year 2300', 'year 1900', 'year 2200']
})
print("Original DataFrame:")
print(df)
def find_punctuations(text):
result = re.findall(r'[!"\$%&\'()*+,\-.\/:;=#@?\[\\\]^_`{|}~]*', text)
string="".join(result)
return list(string)
df['nonalpha']=df['company_code'].apply(lambda x: find_punctuations(x))
print("\nExtracting punctuation:")
print(df)
Sample Output:
Original DataFrame: company_code year 0 c0001. year 1800 1 c000,2 year 1700 2 c0003 year 2300 3 c0003# year 1900 4 c0004, year 2200 Extracting punctuation: company_code year nonalpha 0 c0001. year 1800 [.] 1 c000,2 year 1700 [,] 2 c0003 year 2300 [] 3 c0003# year 1900 [#] 4 c0004, year 2200 [,]
Python Code Editor:
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Previous: Write a Pandas program to extract only non alphanumeric characters from the specified column of a given DataFrame.
Next: Write a Pandas program to remove repetitive characters from the specified column of a given DataFrame.
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Find current directory and file's directory:
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To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
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