我最近开始学习更多关于Python包和模块的知识。我目前正忙于更新现有模块,以便可以作为脚本运行或作为模块导入到其他代码中。我不知道如何在模块内构造输入参数并将它们传递给模块内的main()函数。
我已经编写了我的main()函数,并在传递输入参数时在下调用它。输入目前是硬编码,以显示我正在努力实现的目标。对于如何正确构造用户将要传递的输入参数(然后传递给主函数)的任何帮助,我们都将不胜感激。
如前所述,当直接使用或作为模块导入到其他代码中并从中运行时,我正试图将以下内容用作脚本。如果将其作为模块导入,导入时是否调用main()函数?下面的结构在我写下面的文章时正确吗?任何建议都很感激。
'''
Created on March 12, 2017
Create a new ArcHydro Schema
File Geodatabase and Rasters
Folder
@author: PeterW
'''
# import site-packages and modules
import re
from pathlib import Path
import arcpy
# set environment settings
arcpy.env.overwriteOutput = True
def archydro_rasters_folder(workspace):
"""Create rasters folder directory
if it doens't already exist"""
model_name = Path(workspace).name
layers_name = re.sub(r"\D+", "Layers", model_name)
layers_folder = Path(workspace, layers_name)
if layers_folder.exists():
arcpy.AddMessage("Rasters folder: {0} exists".format(layers_name))
else:
layers_folder.mkdir(parents=True)
arcpy.AddMessage("Rasters folder {0} created".format(layers_name))
def archydro_fgdb_schema(workspace, schema, dem):
"""Create file geodatabase using XML
schema and set coordinate system based
on input DEM if it doesn't already exist"""
model_name = Path(workspace).name
fgdb = "{0}.gdb".format(model_name)
if arcpy.Exists(str(Path(workspace, fgdb))):
arcpy.AddMessage("{0} file geodatabase exists".format(fgdb))
else:
new_fgdb = arcpy.CreateFileGDB_management(str(workspace), fgdb)
import_type = "SCHEMA_ONLY"
config_keyword = "DEFAULTS"
arcpy.AddMessage("New {0} file geodatabase created".format(fgdb))
arcpy.ImportXMLWorkspaceDocument_management(new_fgdb, schema,
import_type,
config_keyword)
arcpy.AddMessage("ArcHydro schema imported")
projection = arcpy.Describe(dem).spatialReference
projection_name = projection.PCSName
feature_dataset = Path(workspace, fgdb, "Layers")
arcpy.DefineProjection_management(str(feature_dataset),
projection)
arcpy.AddMessage("Changed projection to {0}".format(projection_name))
def main(workspace, dem, schema):
"""main function to create rasters folder
and file geodatabase"""
archydro_rasters_folder(workspace)
archydro_fgdb_schema(schema, dem, workspace)
if __name__ == '__main__':
main(workspace = r"E:\Projects\2016\01_Bertrand_Small_Projects\G113268\ArcHydro\Model04",
dem = r"E:\Projects\2016\01_Bertrand_Small_Projects\G113268\ArcHydro\DEM2\raw",
schema = r"E:\Python\Masters\Schema\ESRI_UC12\ModelBuilder\Schema\Model01.xml")
更新日期:2013年3月17日
以下是我根据Jonathan的建议更新的Python模块:
'''
Created on March 12, 2017
Create a new ArcHydro Schema
File Geodatabase and Rasters
Folder
@author: PeterW
'''
# import site-packages and modules
import re
from pathlib import Path
import arcpy
import argparse
# set environment settings
arcpy.env.overwriteOutput = True
def rasters_directory(workspace):
"""Create rasters folder directory
if it doens't already exist"""
model_name = Path(workspace).name
layers_name = re.sub(r"\D+", "Layers", model_name)
layers_folder = Path(workspace, layers_name)
if layers_folder.exists():
arcpy.AddMessage("Rasters folder: {0} exists".format(layers_name))
else:
layers_folder.mkdir(parents=True)
arcpy.AddMessage("Rasters folder {0} created".format(layers_name))
def fgdb_schema(workspace, schema, dem):
"""Create file geodatabase using XML
schema and set coordinate system based
on input DEM if it doesn't already exist"""
model_name = Path(workspace).name
fgdb = "{0}.gdb".format(model_name)
if arcpy.Exists(str(Path(workspace, fgdb))):
arcpy.AddMessage("{0} file geodatabase exists".format(fgdb))
else:
new_fgdb = arcpy.CreateFileGDB_management(str(workspace), fgdb)
import_type = "SCHEMA_ONLY"
config_keyword = "DEFAULTS"
arcpy.AddMessage("New {0} file geodatabase created".format(fgdb))
arcpy.ImportXMLWorkspaceDocument_management(new_fgdb, schema,
import_type,
config_keyword)
arcpy.AddMessage("ArcHydro schema imported")
projection = arcpy.Describe(dem).spatialReference
projection_name = projection.PCSName
feature_dataset = Path(workspace, fgdb, "Layers")
arcpy.DefineProjection_management(str(feature_dataset),
projection)
arcpy.AddMessage("Changed projection to {0}".format(projection_name))
def model_schema(workspace, schema, dem):
"""Create model schema: rasters folder
and file geodatabase"""
rasters_directory(workspace)
fgdb_schema(schema, dem, workspace)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Create a ArcHydro schema')
parser.add_argument('--workspace', metavar='path', required=True,
help='the path to workspace')
parser.add_argument('--schema', metavar='path', required=True,
help='path to schema')
parser.add_argument('--dem', metavar='path', required=True,
help='path to dem')
args = parser.parse_args()
model_schema(workspace=args.workspace, schema=args.schema, dem=args.dem)
我看这是正确的,是的,如果你想使用这个模块,你将导入主。不过,最好用更具描述性的方式来命名。
阐明
__main__
和函数main()
是如何工作的。当您执行一个模块时,它将有一个存储在__name__
中的名称。如果以脚本的形式单独执行模块,它将具有名称__main__
。如果将其作为模块的一部分执行,即将其导入到另一个模块中,则它将具有该模块的名称。函数
main()
可以命名为任何您想要的名称,这不会影响您的程序。在小脚本中,它通常被命名为main
,但如果它是一个较大代码体的一部分,则不是一个特别好的名称。在允许用户在作为脚本运行时输入参数方面,我将使用^{} 或^{} 来研究
argparse如何工作的示例。
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