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import pandas as pd
filenameStr = 'test.csv' csv = pd.read_csv(filenameStr, encoding='ISO-8859-1', dtype=str, usecols=['project path', 'visits'])
print(len(csv))
project_path = csv['project path']
group_names = [] project_names = []
for index, project in enumerate(project_path): group_names.append(project.split('/')[3]) project_names.append(project.split('/')[4])
csv['group_name'] = group_names csv['project_name'] = project_names
drop_none = csv.dropna(how='any') drop_none.to_csv('test.csv', columns=['project path', 'visits', 'group_name', 'project_name'], index=False) print(len(drop_none))