[英]printing table in format without using a library, SQLite 3 python
我想以更好的格式打印数据库中的数据,这是我制作的游戏。 这是代码:
def read_all_tables(self):
self.cursor.execute('SELECT Name, Gender, Age, Score, Date, Time FROM Link JOIN Scores ON Score_ID = Scores.ID JOIN Player ON Player_ID = Player.id ORDER BY Score DESC')
Data = self.cursor.fetchall()
for Row in Data:
print()
for record in range(len(Row)):
print(Row[record], end=" ")
输出为:
HAMMAD MALE 18 900 07/01/18 13:07:02
HAMMAD MALE 18 850 07/01/18 13:30:11
INDERVEER MALE 18 750 07/01/18 13:35:46
HAMMAD MALE 18 500 07/01/18 13:08:29
HAMMAD MALE 18 400 07/01/18 14:07:29
PARSA MALE 18 300 07/01/18 13:36:58
HADIA FEMALE 19 300 07/01/18 14:09:37
MANAAL FEMALE 18 100 07/01/18 13:51:40
MICHAL MALE 18 0 07/01/18 13:42:41
HAMMAD MALE 18 0 07/01/18 13:44:04
HADIA FEMALE 19 0 07/01/18 13:45:51
MANAAL FEMALE 18 0 07/01/18 13:53:02
JACK WEIRD 21 0 07/01/18 13:53:49
HAMMAD MALE 18 0 07/01/18 13:54:44
HAMMAD MALE 18 0 07/01/18 13:56:08
MANAAL FEMALE 18 0 07/01/18 13:57:39
PARSA MALE 18 0 07/01/18 13:58:25
HAMMAD MALE 18 0 07/01/18 13:59:08
HAMMAD MALE 18 0 07/01/18 14:10:37
如何对齐它们并具有列标题? 我不想使用任何库。
使用字符串格式化功能:
formatted_row = '{:<10} {:<6} {:>6} {:>6} {:<9} {:<9}'
print(formatted_row.format("Name", "Gender", "Age", "Score", "Date", "Time"))
for Row in Data:
print(formatted_row.format(*Row))
输出:
Name Gender Age Score Date Time
HAMMAD MALE 18 900 07/01/18 13:07:02
HAMMAD MALE 18 850 07/01/18 13:30:11
INDERVEER MALE 18 750 07/01/18 13:35:46
HAMMAD MALE 18 500 07/01/18 13:08:29
HAMMAD MALE 18 400 07/01/18 14:07:29
PARSA MALE 18 300 07/01/18 13:36:58
HADIA FEMALE 19 300 07/01/18 14:09:37
MANAAL FEMALE 18 100 07/01/18 13:51:40
...
在这种方法中,我们对列的宽度进行了硬编码。 为了动态调整列的宽度,我们将不得不做更多的工作。 希望这对您有用。
为了动态调整宽度,我们需要两次传递数据:第一次确定每一列的最大宽度,第二次确定要打印的宽度。
# Determine the longest width for each column
header = ("Name", "Gender", "Age", "Score", "Date", "Time")
widths = [len(cell) for cell in header]
for row in Data:
for i, cell in enumerate(row):
widths[i] = max(len(str(cell)), widths[i])
# Construct formatted row like before
formatted_row = ' '.join('{:%d}' % width for width in widths)
print('DEBUG: widths={!r}'.format(widths))
print('DEBUG: formatted_row={!r}'.format(formatted_row))
print(formatted_row.format(*header))
for row in Data:
print(formatted_row.format(*row))
输出:
DEBUG: widths=[9, 6, 3, 5, 8, 8]
DEBUG: formatted_row='{:9} {:6} {:3} {:5} {:8} {:8}'
Name Gender Age Score Date Time
HAMMAD MALE 18 900 07/01/18 13:07:02
HAMMAD MALE 18 850 07/01/18 13:30:11
INDERVEER MALE 18 750 07/01/18 13:35:46
...
对结果满意后,可以删除DEBUG行。 它们在那里显示代码如何工作。
对于标题,只需选择所需的文本,例如
select 'Name Gender Age ...';
要格式化数据,请使用printf()函数(请参阅https://sqlite.org/lang_corefunc.html#printf ),例如
select printf('%-20s %-6s %2d ....', Name, Gender, Age, ...) from ...;
(根据需要进行调整。)
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