Python argparse：“无法识别的参数”
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Python argparse: "unrecognized arguments"
提问by Zvonimir Peran
I am trying to use my program with command line option. Here is my code:
我正在尝试将我的程序与命令行选项一起使用。这是我的代码：
import argparse
def main():
parser = argparse.ArgumentParser()
parser.add_argument("-u","--upgrade", help="fully automatized upgrade")
args = parser.parse_args()
if args.upgrade:
print "Starting with upgrade procedure"
main()
When I try to run my program from terminal (python script.py -u), I expect to get the message Starting with upgrade procedure, but instead I get the error message unrecognized arguments -u.
当我尝试从终端 ( python script.py -u)运行我的程序时，我希望收到消息Starting with upgrade procedure，但我收到的是错误消息unrecognized arguments -u。
采纳答案by Rakholiya Jenish
The error you are getting is because -uis expecting a some value after it. If you use python script.py -hyou will find it in usage statement saying [-u UPGRADE].
您得到的错误是因为-u期望在它之后有一些价值。如果您使用，python script.py -h您会在使用声明中找到它[-u UPGRADE]。
If you want to use it as boolean or flag (true if -uis used), add an additional parameter action:
如果要将其用作布尔值或标志（如果-u使用则为 true ），请添加一个附加参数action：
parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action="store_true")
action- The basic type of action to be taken when this argument is encountered at the command line
action- 在命令行遇到此参数时要采取的基本操作类型
With action="store_true", if the option -uis specified, the value True is assigned to args.upgrade. Not specifying it implies False.
对于action="store_true"，如果-u指定了该选项，则将值 True 分配给args.upgrade。不指定它意味着 False。
Source: Python argparse documentation
回答by Anand S Kumar
Currently, your argument requires a value to be passed in for it as well.
目前，您的参数还需要为其传入一个值。
If you want -uas an option instead, Use the action='store_true'for arguments that do not need a value.
如果您想要-u作为选项，请使用action='store_true'for 不需要值的参数。
Example -
例子 -
parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action='store_true')
回答by Nitesh Patel
For Boolean arguments use action="store_true":
对于布尔参数，使用 action="store_true"：
parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action="store_true")
See: https://docs.python.org/2/howto/argparse.html#introducing-optional-arguments
请参阅：https: //docs.python.org/2/howto/argparse.html#introducing-optional-arguments
