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import types
def joinCSVFields(fields):
"""
Returns a CSV record (eg a string) from a sequence of fields.
Fields containing commands (,) or double quotes (") are quotes
and double quotes are escaped (""). The terminating newline is
NOT included.
"""
newFields = []
for field in fields:
assert type(field) is types.StringType
if field.find('"')!=-1:
newField = '"' + field.replace('"', '""') + '"'
elif field.find(',')!=-1 or field.find('\n')!=-1 or field.find('\r')!=-1:
newField = '"' + field + '"'
else:
newField = field
newFields.append(newField)
return ','.join(newFields)
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