argparse
来接收输入并将其传递给一个需要两个变量和**kwargs
作为参数的函数。这是我的函数:
import requests
import sys
import argparse
def location_by_coordinate(LAT, LNG, **kwargs):
if not kwargs:
coordinate_url = "https://api.instagram.com/v1/locations/search?lat=%s&lng=%s&access_token=%s" % (LAT, LNG, current_token)
r = requests.get(coordinate_url).text
else:
coordinate_url = "https://api.instagram.com/v1/locations/search?lat=%s&lng=%s&access_token=%s" % (LAT, LNG, current_token)
for key, value in kwargs.iteritems():
if 'DISTANCE' in kwargs:
distance = kwargs.get('DISTANCE')
if distance > 5000:
print distance
print "max distance is 5000m, value is reassigned to default of 1000m"
distance = 1000
coordinate_url = "https://api.instagram.com/v1/locations/search?lat=%s&lng=%s&access_token=%s" % (LAT, LNG, current_token)
r = requests.get(coordinate_url).text
else:
pass
coordinate_url = "https://api.instagram.com/v1/locations/search?lat=%s&lng=%s&access_token=%s" % (LAT, LNG, current_token)
r = requests.get(coordinate_url).text
if 'FACEBOOK_PLACES_ID' in kwargs:
fb_places_id = kwargs.get('FACEBOOK_PLACES_ID')
payload = {'FACEBOOK_PLACES_ID': '%s' % (fb_places_id), 'DISTANCE': '%s' % (DISTANCE)}
r = requests.get(coordinate_url, params=payload).text
if 'FOURSQUARE_ID' in kwargs:
foursquare_id = kwargs.get('FOURSQUARE_ID')
payload = {'FOURSQUARE_ID': '%s' % (foursquare_id), 'DISTANCE': '%s' % (DISTANCE)}
r = requests.get(coordinate_url, params=payload).text
if 'FOURSQUARE_V2_ID' in kwargs:
foursquare_v2_id = kwargs.get('FOURSQUARE_V2_ID')
payload = {'FOURSQUARE_V2_ID': '%s' % (foursquare_v2_id), 'DISTANCE': '%s' % (DISTANCE)}
r = requests.get(coordinate_url, params=payload).text
#print r
return r
考虑到该函数使用了 **kwargs,我应该如何设置子解析器?
目前为止,这是我设置命令行解析器的方式:
def main():
parser = argparse.ArgumentParser(description="API Endpoints tester")
subparsers = parser.add_subparsers(dest="command", help="Available commands")
location_by_parser = subparsers.add_parser("location_by_coordinate", help="location function")
location_by_parser.add_argument("LAT", help="latitude")
location_by_parser.add_argument("LNG", help="longitude")
arguments = parser.parse_args(sys.argv[1:])
arguments = vars(arguments)
command = arguments.pop("command")
if command == "location_by_coordinate":
LAT, LNG = location_by_coordinate(**arguments)
else:
print "No command provided..."
if __name__ == "__main__":
main()
很明显,当我通过命令行调用location_by_coordinate()函数时,上述main()函数可以正常工作,如下所示:
$ python argstest.py location_by_coordinate 40.5949799 -73.9495148
但是目前的代码如此,如果我尝试:
$ python argstest.py location_by_coordinate 40.5949799 -73.9495148 DISTANCE=3000
显然,我得到:
argstest.py: error: unrecognized arguments: DISTANCE=3000
但我不确定如何为 **kwargs 设置子解析器。 如果我尝试像这样设置子解析器:
location_by_parser.add_argument("**kwargs", help="**kwargs")
然后再尝试运行该命令:
$ python argstest.py location_by_coordinate 40.5949799 -73.9495148 DISTANCE=3000
那么这个方法行不通,因为arguments
对象(它是一个字典),变成了这样:
{'LAT': '40.5949799', 'LNG': '-73.9495148', 'command': 'location_by_coordinate', '**kwargs': 'DISTANCE=3000'
}
然后会返回这个Traceback:
Traceback (most recent call last):
File "argstest.py", line 118, in <module>
main()
File "argstest.py", line 108, in main
foo = location_by_coordinate(**arguments)
File "argstest.py", line 40, in location_by_coordinate
return r
UnboundLocalError: local variable 'r' referenced before assignment
我该如何启用argparse来处理从命令行输入的意图通过**kwargs传递给函数的内容? 答案:
我该如何启用argparse来处理从命令行输入的意图通过**kwargs传递给函数的内容?
argparse
之上的包,叫做plac
。它试图基于一个或多个函数的参数定义来填充解析器。https://pypi.python.org/pypi/plac - hpaulj