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tableformat.py
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88 lines (63 loc) · 1.94 KB
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# Provides classes to format tables in different ways
class TableFormatter:
def headings(self, headers):
"""
Emit the table headings.
"""
raise NotImplementedError()
def row(self, rowdata):
"""
Emit a single row of table data.
"""
raise NotImplementedError()
class TextTableFormatter(TableFormatter):
def headings(self, headers):
for h in headers:
print(f'{h:>10s}', end=' ')
print()
print(('-'*10 + ' ')*len(headers))
def row(self, rowdata):
for d in rowdata:
print(f'{d:>10s}', end=' ')
print()
class CSVTableFormatter(TableFormatter):
def headings(self, headers):
print(','.join(headers))
def row(self, rowdata):
print(','.join(rowdata))
class HTMLTableFormatter(TableFormatter):
def headings(self, headers):
print('<tr>', end='')
for h in headers:
print(f'<th>{h}</th>', end='')
print('</tr>')
def row(self, rowdata):
print('<tr>', end='')
for d in rowdata:
print(f'<td>{d}</td>', end='')
print('</tr>')
def create_formatter(fmt):
if fmt == 'txt':
return TextTableFormatter()
if fmt == 'csv':
return CSVTableFormatter()
if fmt == 'html':
return HTMLTableFormatter()
raise FormatError(f'Unknown format {fmt}')
class FormatError(Exception):
pass
def print_table(data, colnames, formatter):
cap_colnames = [colname.capitalize() for colname in colnames]
formatter.headings(cap_colnames)
for row in data:
rowdata = []
for colname in colnames:
value = getattr(row, colname)
if isinstance(value, str):
pass
elif isinstance(value, float):
value = f'{value:0.2f}'
else:
value = str(value)
rowdata.append(value)
formatter.row(rowdata)