python - 使用 file.write 的 Python 语法无效

Question

尝试学习一些地理空间 python。或多或少遵循类笔记here .

My Code

#!/usr/bin/python

# import modules
import ogr, sys, os

# set working dir
os.chdir('/home/jacques/misc/pythongis/data')

# create the text file we're writing to
file = open('data_export.txt', 'w')

# import the required driver for .shp
driver = ogr.GetDriverByName('ESRI Shapefile')

# open the datasource
data = driver.Open('road_surveys.shp', 1)
if data is None:
    print 'Error, could not locate file'
    sys.exit(1)

# grab the datalayer
layer = data.GetLayer()

# loop through the features
feature = layer.GetNextFeature()
while feature:

    # acquire attributes
    id = feature.GetFieldAsString('Site_Id')
    date = feature.GetFieldAsString('Date')

    # get coordinates
    geometry = feature.GetGeometryRef()
    x = str(geometry.GetX())
    y = str(geometry.GetY()

    # write to the file
    file.Write(id + ' ' + x + ' ' + y + ' ' + cover + '\n')

    # remove the current feature, and get a new one
    feature.Destroy()
    feature = layer.GetNextFeature()

# close the data source
datasource.Destroy()
file.close()

运行得到以下结果:

  File "shape_summary.py", line 38
    file.write(id + ' ' + x + ' ' + y + ' ' + cover + '\n')
       ^
SyntaxError: invalid syntax

运行 Python 2.7.1

任何帮助都会很棒!

Answer 1

上一行缺少右括号:

y = str(geometry.GetY())

此外，只是一个风格注释:避免在 python 中使用变量名 file 是个好主意，因为它实际上是有意义的。尝试打开一个新的 Python session 并运行 help(file)