目标：删除 xml_str 字符串里面多余的空白字符，让文字内容更紧凑输出
import rexml_str = """<?xml version="1.0" encoding="UTF-8"?><TowerRouteTask><FileVer>TowerRouteTask-1.0</FileVer><CreateTime>-05-09 13:47</CreateTime><TaskName>崇玉线_04#</TaskName><TowerNum>1</TowerNum><PointNum>17</PointNum><UseRtk>true</UseRtk><TowerRoute><LineName>崇玉线</LineName><TowerID>04#</TowerID><Level>220kV</Level><Location>114.6833570,36.5894932</Location><Camera>大疆M210 RTK V2+X5S 15mm</Camera><PointNum>17</PointNum><Point><PointID>P03</PointID><Latitude>36.589567522511</Latitude><Longitude>114.683474283505</Longitude><Altitude>82.971476941025</Altitude><Yaw>-149,-138,-164,-122,-111,-96</Yaw><Pitch>-9,-6,-11,-8,-9,-10</Pitch><Angle>22.78,6.60,7.97,5.62,20.29,8.18</Angle><Yaw>0</Yaw><Pitch>0</Pitch><type>4</type><id>2</id><variety>0</variety><number>34</number><angle>30</angle><object>11</object><side>A</side><angletype>8</angletype><ZoomPos>33</ZoomPos></Point><Point><PointID>P03</PointID><Latitude>36.589567522511</Latitude><Longitude>114.683474283505</Longitude><Altitude>82.971476941025</Altitude><Yaw>-149,-138,-164,-122,-111,-96</Yaw><Pitch>-9,-6,-11,-8,-9,-10</Pitch><Angle>22.78,6.60,7.97,5.62,20.29,8.18</Angle><Yaw>0</Yaw><Pitch>0</Pitch><type>4</type><id>2</id><variety>0</variety><number>35</number><angle>30</angle><object>11</object><side>A</side><angletype>8</angletype><ZoomPos>33</ZoomPos></Point><Point><PointID>P09</PointID><Latitude>36.589376059305</Latitude><Longitude>114.683264893488</Longitude><Altitude>70.170726901929</Altitude><Yaw>34,34,34,40,50,60</Yaw><Pitch>-7,-13,-19,-4,-6,-7</Pitch><Angle>3.81,13.63,4.05,3.79,15.54,4.23</Angle><Yaw>0</Yaw><Pitch>0</Pitch><type>4</type><id>2</id><variety>0</variety><number>87</number><angle>30</angle><object>11</object><side>A</side><angletype>8</angletype><ZoomPos>33</ZoomPos></Point><Point><PointID>P09</PointID><Latitude>36.589376059305</Latitude><Longitude>114.683264893488</Longitude><Altitude>70.170726901929</Altitude><Yaw>34,34,34,40,50,60</Yaw><Pitch>-7,-13,-19,-4,-6,-7</Pitch><Angle>3.81,13.63,4.05,3.79,15.54,4.23</Angle><Yaw>0</Yaw><Pitch>0</Pitch><type>4</type><id>2</id><variety>0</variety><number>88</number><angle>30</angle><object>11</object><side>A</side><angletype>8</angletype><ZoomPos>33</ZoomPos></Point></TowerRoute></TowerRouteTask>"""rst = re.sub('\n\s*\n', '\n', xml_str)print(rst)
