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期望的結果: 我試圖生成一個可縮放的矢量圖形,顯示我們的救護車的位置和一個顏色,指示救護車是否繁忙,停止服務,宿舍等。我們在路上的醫護人員可以將此視爲網頁,並將我們所有救護車的配置視爲地圖。他們一眼就能看到哪些救護車正忙着哪些是免費的。python和ElementTree編寫一行長輸出
我的方法: 我使用python 2.7與pyodbc和xml.etree。 我正在查詢我們的數據庫,以確定最近的救護車狀態,循環訪問陣列並生成數據的svg。
問題: 當輸出寫出到文本中,並使用記事本打開.svg文件時,我看到有一行很長的輸出。我想它是嵌套的輸出。如果你看看我的代碼,你會看到我只測試了兩輛救護車。但我的系統中有50輛救護車。我不能有一個長長的數千個字符。
問題: 我如何讓python/ElementTree在輸出中寫出換行符?如下圖所示
代碼:
import pyodbc
from xml.etree import ElementTree as et
cnxn = pyodbc.connect('DRIVER={SQL Server}; SERVER=my server; DATABASE=my database; UID=my user id; PWD=my password')
cursor = cnxn.cursor()
AmbulanceStatus = """
WITH Maxtimes AS
(
SELECT
MAX(M_Manpower_PK) AS [FirstRecord]
, PUN_UnitID
FROM MManpower
INNER JOIN PUnit ON M_kUnit = PUN_Unit_PK
WHERE PUN_UnitID LIKE 'M__'
OR PUN_UnitID LIKE 'FBA__'
AND M_tTime > DATEADD(HOUR, -24, GETDATE())
GROUP BY PUN_UnitID
)
,
MaxAttributes AS
(
SELECT
M_Manpower_PK
, M_tTime
, M_Code
, CASE
WHEN M_Code IN ('USTA', 'USER', 'USOL', 'USAR', 'USIZ', 'UF', 'USTR', 'USDP') THEN 'Working'
WHEN M_Code IN ('USAQ', 'USRQ') THEN 'Free'
WHEN M_Code IN ('USES', 'USSB', 'USAS', 'USRS', 'USLC') THEN 'Standby'
WHEN M_Code IN ('USOS') THEN 'OutofService'
ELSE 'NA'
END AS [Disposition]
FROM MManpower
INNER JOIN PUnit ON M_kUnit = PUN_Unit_PK
WHERE PUN_UnitID LIKE 'M__'
OR PUN_UnitID LIKE 'FBA__'
AND M_tTime > DATEADD(HOUR, -24, GETDATE())
)
SELECT
MaxTimes.firstRecord AS [RecordNumber]
, MaxTimes.PUN_UnitID AS [Ambulance]
, CONVERT(VARCHAR(20), MaxAttributes.M_tTime, 108) AS [FinalTimeStamp]
, MaxAttributes.M_Code AS [UnitStatus]
, MaxAttributes.Disposition AS [Disposition]
FROM Maxtimes
LEFT OUTER JOIN MaxAttributes ON Maxtimes.FirstRecord=MaxAttributes.M_Manpower_PK
"""
cursor.execute(AmbulanceStatus)
Ambulances = cursor.fetchall()
cursor.close()
for ambulance in Ambulances:
print ambulance
doc = et.Element('svg', width='792', height='612', version='1.1', xmlns='http://www.w3.org/2000/svg')
#===============================================================================
# I have no idea how to implement the following 15 lines of code. I downloaded them from the internet. I have googled this question and someone believes the following lines of code can help write out carriage returns.
#===============================================================================
# def indent(elem, level=0):
# i = "\n" + level * " "
# if len(elem):
# if not elem.text or not elem.text.strip():
# elem.text = i + " "
# if not elem.tail or not elem.tail.strip():
# elem.tail = i
# for elem in elem:
# indent(elem, level + 1)
# if not elem.tail or not elem.tail.strip():
# elem.tail = i
# else:
# if level and (not elem.tail or not elem.tail.strip()):
# elem.tail = i
#===============================================================================
j = 0
#===============================================================================
# medic 19
#===============================================================================
while j < len(Ambulances):
if Ambulances[j][1] == 'M19' and Ambulances[j][4] == 'Free':
fillColor = 'aliceblue'
fillText = 'black'
et.SubElement(doc, 'circle', cx='520', cy='85', r='10', stroke='black', fill=fillColor)
text = et.Element('text', x='520', y='85', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M19' and Ambulances[j][4] == 'Working':
fillColor = 'red'
fillText = 'white'
et.SubElement(doc, 'circle', cx='520', cy='85', r='10', fill=fillColor)
text = et.Element('text', x='520', y='85', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M19' and Ambulances[j][4] == 'Standby':
fillColor = 'green'
fillText = 'white'
et.SubElement(doc, 'circle', cx='520', cy='85', r='10', fill=fillColor)
text = et.Element('text', x='520', y='85', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M19' and Ambulances[j][4] == 'OutofService':
fillColor = 'black'
fillText = 'white'
et.SubElement(doc, 'circle', cx='520', cy='85', r='10', fill=fillColor)
text = et.Element('text', x='520', y='85', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M19' and Ambulances[j][4] == 'NA':
fillColor = 'pink'
fillText = 'blue'
et.SubElement(doc, 'circle', cx='520', cy='85', r='10', fill=fillColor)
text = et.Element('text', x='520', y='85', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
#===============================================================================
# medic 16
#===============================================================================
elif Ambulances[j][1] == 'M16' and Ambulances[j][4] == 'Free':
fillColor = 'aliceblue'
fillText = 'black'
et.SubElement(doc, 'circle', cx='28.80024', cy='45.8372', r='10', stroke='black', fill=fillColor)
text = et.Element('text', x='28.80024', y='45.8372', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M16' and Ambulances[j][4] == 'Working':
fillColor = 'red'
fillText = 'blue'
et.SubElement(doc, 'circle', cx='28.80024', cy='45.8372', r='10', fill=fillColor)
text = et.Element('text', x='28.80024', y='45.8372', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M16' and Ambulances[j][4] == 'Standby':
fillColor = 'green'
fillText = 'white'
et.SubElement(doc, 'circle', cx='28.80024', cy='45.8372', r='10', fill=fillColor)
text = et.Element('text', x='28.80024', y='45.8372', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M16' and Ambulances[j][4] == 'OutofService':
fillColor = 'black'
fillText = 'white'
et.SubElement(doc, 'circle', cx='28.80024', cy='45.8372', r='10', fill=fillColor)
text = et.Element('text', x='28.80024', y='45.8372', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
elif Ambulances[j][1] == 'M16' and Ambulances[j][4] == 'NA':
fillColor = 'pink'
fillText = 'blue'
et.SubElement(doc, 'circle', cx='28.80024', cy='45.8372', r='10', fill=fillColor)
text = et.Element('text', x='28.80024', y='45.8372', fill=fillText, style='font-family:Sans;font-size:12px;text-anchor:middle;dominant-baseline:top')
text.text = Ambulances[j][1]
doc.append(text)
#===============================================================================
# loop through the array
#===============================================================================
j = j + 1
# ElementTree 1.2 doesn't write the SVG file header errata, so do that manually
f = open('C:\sample.svg', 'w')
f.write('<?xml version=\'1.0\' standalone=\'no\'?>\n')
f.write('<!DOCTYPE svg PUBLIC \'-//W3C//DTD SVG 1.1//EN\'\n')
f.write('\'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\'>\n')
f.write(et.tostring(doc))
f.close()
您是否嘗試過加入你追加它之前新的行字符的文本? – AlexLordThorsen 2013-03-14 19:39:58