1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
""" Tablib - XLSX Support.
"""
from io import BytesIO
from openpyxl.reader.excel import ExcelReader, load_workbook
from openpyxl.styles import Alignment, Font
from openpyxl.utils import get_column_letter
from openpyxl.workbook import Workbook
from openpyxl.writer.excel import ExcelWriter
import tablib
class XLSXFormat:
title = 'xlsx'
extensions = ('xlsx',)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is a readable excel file."""
try:
# No need to fully load the file, it should be enough to be able to
# read the manifest.
reader = ExcelReader(stream, read_only=False)
reader.read_manifest()
return True
except Exception:
return False
@classmethod
def export_set(cls, dataset, freeze_panes=True):
"""Returns XLSX representation of Dataset."""
wb = Workbook()
ws = wb.worksheets[0]
ws.title = dataset.title if dataset.title else 'Tablib Dataset'
cls.dset_sheet(dataset, ws, freeze_panes=freeze_panes)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
@classmethod
def export_book(cls, databook, freeze_panes=True):
"""Returns XLSX representation of DataBook."""
wb = Workbook()
for sheet in wb.worksheets:
wb.remove(sheet)
for i, dset in enumerate(databook._datasets):
ws = wb.create_sheet()
ws.title = dset.title if dset.title else 'Sheet%s' % (i)
cls.dset_sheet(dset, ws, freeze_panes=freeze_panes)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
@classmethod
def import_set(cls, dset, in_stream, headers=True, read_only=True):
"""Returns databook from XLS stream."""
dset.wipe()
xls_book = load_workbook(in_stream, read_only=read_only, data_only=True)
sheet = xls_book.active
dset.title = sheet.title
for i, row in enumerate(sheet.rows):
row_vals = [c.value for c in row]
if (i == 0) and (headers):
dset.headers = row_vals
else:
dset.append(row_vals)
@classmethod
def import_book(cls, dbook, in_stream, headers=True, read_only=True):
"""Returns databook from XLS stream."""
dbook.wipe()
xls_book = load_workbook(in_stream, read_only=read_only, data_only=True)
for sheet in xls_book.worksheets:
data = tablib.Dataset()
data.title = sheet.title
for i, row in enumerate(sheet.rows):
row_vals = [c.value for c in row]
if (i == 0) and (headers):
data.headers = row_vals
else:
if i > 0 and len(row_vals) < data.width:
row_vals += [''] * (data.width - len(row_vals))
data.append(row_vals)
dbook.add_sheet(data)
@classmethod
def dset_sheet(cls, dataset, ws, freeze_panes=True):
"""Completes given worksheet from given Dataset."""
_package = dataset._package(dicts=False)
for i, sep in enumerate(dataset._separators):
_offset = i
_package.insert((sep[0] + _offset), (sep[1],))
bold = Font(bold=True)
wrap_text = Alignment(wrap_text=True)
for i, row in enumerate(_package):
row_number = i + 1
for j, col in enumerate(row):
col_idx = get_column_letter(j + 1)
cell = ws[f'{col_idx}{row_number}']
# bold headers
if (row_number == 1) and dataset.headers:
cell.font = bold
if freeze_panes:
# Export Freeze only after first Line
ws.freeze_panes = 'A2'
# bold separators
elif len(row) < dataset.width:
cell.font = bold
# wrap the rest
else:
try:
str_col_value = str(col)
except TypeError:
str_col_value = ''
if '\n' in str_col_value:
cell.alignment = wrap_text
try:
cell.value = col
except (ValueError, TypeError):
cell.value = str(col)
|
