Python和ReportLab:PDF表格中列宽和对齐方式错误

8
我将使用Python 2.7(iOS Pythonista应用程序)和reportlab 2.7模块创建一个包含表格的PDF,一切都运行良好。ReportLab会自动格式化列的宽度,但在两种情况下我无法理解为什么ReportLab会以这种方式格式化输出,并且如何得到我想要的格式。 情况1:几乎符合我的要求……
+-----+----------+---------------+----------+---------------------------------------------------------------------------------------------------------------+
| Day | Date     | Time          | Duration | Notes                                                                                                         |
+-----+----------+---------------+----------+---------------------------------------------------------------------------------------------------------------+
| Tue | 01.04.14 | 14:00 - 17:15 | 3.25     | Here are some notes.                                                                                          |
+-----+----------+---------------+----------+---------------------------------------------------------------------------------------------------------------+
| Wed | 02.04.14 | 18:00 - 20:15 | 2.25     | Sometime these notes are a little longer text so there must be a line break to let the whole note be visible! |
+-----+----------+---------------+----------+---------------------------------------------------------------------------------------------------------------+
| Thu | 02.04.14 | 14:00 - 17:15 | 3.25     | And sometimes these notes are only a few words.                                                               |
+-----+----------+---------------+----------+---------------------------------------------------------------------------------------------------------------+

案例二:我试图将浮点数对齐

在以下工具的帮助下:

TableStyle([('ALIGN', (3,1), (3,-1), 'DECIMAL'),])

我试图让每个浮点数都在同一竖直线上。这样做可以实现,但在“持续时间”列中,所有内容都对齐到右侧,导致“注释”列中的数字部分被遮盖(而且“持续时间”值的左侧有很多空白)。看起来好像是将右边距设置为小数点或小数点前的数字,而不是整个值。

+-----+----------+---------------+-----------+-------------------------------------------------+
| Day | Date     | Time          | Duration  | Notes                                           |
+-----+----------+---------------+-----------+-------------------------------------------------+
| Tue | 01.04.14 | 14:00 - 17:15 |        3.2|5Here are some notes.                            |
+-----+----------+---------------+-----------+-------------------------------------------------+
| Wed | 02.04.14 | 14:00 - 17:15 |        3.2|5And sometimes these notes are only a few words. |
+-----+----------+---------------+-----------+-------------------------------------------------+

借助于

TableStyle([('RIGHTPADDING', (3,1), (3,-1), 18),])

我得到了更好的结果,但我认为应该有更好的方法!?

案例三:尝试换行笔记文本。

当我使用段落插入笔记文本时,文本会自动换行,但列宽令人惊讶。我无法像下面的示例一样精确地获得真实输出。

整个表格宽度适合文档(DIN A4没有边距)。但似乎每一列都获得了相等的宽度。所以Day、Date、Time和Duration列比它们需要的宽得多,而Notes列比它们需要的窄得多。这两件事情我无法在下面的示例表格中如愿演示,但我相信你的想象力;-)。

+-----+----------+---------------+----------+----------------------+
| Day | Date     | Time          | Duration | Notes                |
+-----+----------+---------------+----------+----------------------+
| Tue | 01.04.14 | 14:00 - 17:15 | 3.25     | Here are some notes. |
+-----+----------+---------------+----------+----------------------+
| Wed | 02.04.14 | 18:00 - 20:15 | 2.25     | Sometime these       |
|     |          |               |          | notes are a          |
|     |          |               |          | little longer        |
|     |          |               |          | text so there        |
|     |          |               |          | must be a line       |
|     |          |               |          | break to let         |
|     |          |               |          | the whole note       |
|     |          |               |          | be visible!          |
+-----+----------+---------------+----------+----------------------+
| Thu | 02.04.14 | 14:00 - 17:15 | 3.25     | And sometimes        |
|     |          |               |          | these notes are      |
|     |          |               |          | only a few words.    |
+-----+----------+---------------+----------+----------------------+

这里是我使用的代码:

import pipista
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.platypus import SimpleDocTemplate, Paragraph, Table, TableStyle

styleSheet = getSampleStyleSheet()

def makeReportData(n):
  monthreport = []
  monthreport += ('Day', '', 'Time', 'Duration', 'Notes'),
  monthreport += ('Tue', '01.04.14', '14:00 - 17:15', '3.25', n[0]),
  monthreport += ('Wed', '02.04.14', '14:00 - 17:15', '3.25', n[1]),
  monthreport += ('Thu', '03.04.14', '14:00 - 17:15', '3.25', n[2]),
  return monthreport

notes = ['Here are some notes.',
         'Sometime these notes are a little longer text so there must be a line break to let the whole note be visible!',
         'And sometimes these notes are only a few words.']

paranote = []
for note in notes:
  paranote += (Paragraph(note, styleSheet["BodyText"]),)

tstyle = [('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),
          ('BOX', (0,0), (-1,-1), 0.25, colors.black),]

case1 = []
t = Table(makeReportData(notes))
t.setStyle(TableStyle(tstyle))
case1.append(t)
doc = SimpleDocTemplate('Table normal.pdf', pagesize = A4)
doc.build(case1)

case2 = []
tstyledez = tstyle + [('ALIGN', (3,1), (3,-1), 'DECIMAL'),]
t.setStyle(TableStyle(tstyledez))
case2.append(t)
doc = SimpleDocTemplate('Table align decimal.pdf', pagesize = A4)
doc.build(case2)

case3 = []
t = Table(makeReportData(paranote))
tstylepara = tstyle + [('VALIGN',(0,1),(3,-1),'TOP'),]
t.setStyle(TableStyle(tstylepara))
case3.append(t)
doc = SimpleDocTemplate('Table Paragraph.pdf', pagesize = A4)
doc.build(case3)

我希望有人能指导我朝着正确的方向前进。

1个回答

13

好的,始终实践RTM是个好主意! 根据ReportLab文档所述:

如果单元格的值是Flowable或Flowable列表,则这些对象必须具有确定的宽度,或包含它们的列必须具有固定的宽度。

解决方案:

from reportlab.lib.units import mm

t = Table(makeReportData(paranote), colWidths=(None, None, None, None, 100*mm))

我认为DECIMAL对齐的问题(情况2)也可以用同样的方法解决,但这并不起作用。


@shaw2thefloor OP 是那个发表评论的人... 唉 - NorCalKnockOut

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