filepath = "..\folder\data.tsv"
df = pd.read_csv(filepath)

OSError: [Errno 22] Invalid argument: '..\folder\\data.tsv'

应该写成

filepath = r"..\folder\data.tsv"
df = pd.read_csv(filepath)

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

df = pd.read_csv(filepath)

ParserError: Error tokenizing data. C error: Expected 6 fields in line 1117367, saw 7

应该写成

df = pd.read_csv(filepath, sep='delimiter')

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

ParserWarning: Falling back to the 'python' engine because the 'c' engine does not support regex separators (separators > 1 char and different from '\s+' are interpreted as regex); you can avoid this warning by specifying engine='python'.
  return func(*args, **kwargs)

应该写成

df = pd.read_csv(filepath, sep='delimiter', engine='python')