mirror of
https://github.com/ilri/csv-metadata-quality.git
synced 2024-11-22 05:45:02 +01:00
137 lines
3.5 KiB
Python
Executable File
137 lines
3.5 KiB
Python
Executable File
import pandas as pd
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import re
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def whitespace(field):
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"""Fix whitespace issues.
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Return string with leading, trailing, and consecutive whitespace trimmed.
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"""
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# Skip fields with missing values
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if pd.isna(field):
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return
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# Initialize an empty list to hold the cleaned values
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values = list()
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# Try to split multi-value field on "||" separator
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for value in field.split('||'):
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# Strip leading and trailing whitespace
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value = value.strip()
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# Replace excessive whitespace (>2) with one space
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pattern = re.compile(r'\s{2,}')
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match = re.findall(pattern, value)
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if match:
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print(f'Excessive whitespace: {value}')
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value = re.sub(pattern, ' ', value)
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# Save cleaned value
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values.append(value)
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# Create a new field consisting of all values joined with "||"
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new_field = '||'.join(values)
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return new_field
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def separators(field):
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"""Fix for invalid multi-value separators (ie "|")."""
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# Skip fields with missing values
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if pd.isna(field):
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return
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# Initialize an empty list to hold the cleaned values
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values = list()
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# Try to split multi-value field on "||" separator
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for value in field.split('||'):
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# After splitting, see if there are any remaining "|" characters
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pattern = re.compile(r'\|')
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match = re.findall(pattern, value)
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if match:
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print(f'Fixing invalid multi-value separator: {value}')
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value = re.sub(pattern, '||', value)
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# Save cleaned value
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values.append(value)
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# Create a new field consisting of all values joined with "||"
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new_field = '||'.join(values)
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return new_field
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def unnecessary_unicode(field):
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"""Remove unnecessary Unicode characters.
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Removes unnecessary Unicode characters like:
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- Zero-width space (U+200B)
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- Replacement character (U+FFFD)
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- No-break space (U+00A0)
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Return string with characters removed.
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"""
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# Skip fields with missing values
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if pd.isna(field):
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return
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# Check for zero-width space characters (U+200B)
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pattern = re.compile(r'\u200B')
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match = re.findall(pattern, field)
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if match:
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print(f'Removing unnecessary Unicode (U+200B): {field}')
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field = re.sub(pattern, '', field)
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# Check for replacement characters (U+FFFD)
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pattern = re.compile(r'\uFFFD')
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match = re.findall(pattern, field)
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if match:
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print(f'Removing unnecessary Unicode (U+FFFD): {field}')
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field = re.sub(pattern, '', field)
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# Check for no-break spaces (U+00A0)
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pattern = re.compile(r'\u00A0')
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match = re.findall(pattern, field)
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if match:
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print(f'Removing unnecessary Unicode (U+00A0): {field}')
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field = re.sub(pattern, '', field)
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return field
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def duplicates(field):
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"""Remove duplicate metadata values."""
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# Skip fields with missing values
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if pd.isna(field):
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return
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# Try to split multi-value field on "||" separator
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values = field.split('||')
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# Initialize an empty list to hold the de-duplicated values
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new_values = list()
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# Iterate over all values
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for value in values:
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# Check if each value exists in our list of values already
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if value not in new_values:
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new_values.append(value)
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else:
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print(f'Dropping duplicate value: {value}')
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# Create a new field consisting of all values joined with "||"
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new_field = '||'.join(new_values)
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return new_field
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