[英]getting arguments from command line python
I am trying to get three arguments from command line: 我试图从命令行获取三个参数:
-o (for outputfile) -k (number of clusters) -l (data to be clustered)
So i wrote this. 所以我写了这个。
def get_input():
print 'ARGV :', sys.argv[1:]
options, remainder = getopt.getopt(sys.argv[1:], 'o:v:k:l', ['output=',
'verbose',
'k_clust=',
'limit='])
print "options ",options
file_flag , k_flag, count_flag = False, False,False
for opt, arg in options:
print opt
if opt in ('-o', '--output'):
print "here ", opt, arg
output_filename = arg
o_flag = True
if opt in ('-v', '--verbose'):
verbose = True
if opt == '--version':
version = arg
if opt in ('-k','--k_clust'):
print "here", opt, arg
k_clust = arg
k_flag = True
if opt in ('-l','--limit'):
kcount = arg
assert kcount!=0 and kcount!= ''
print "limit ", arg
count_flag = True
if k_flag == False:
sys.exit(" no cluster specified, will be exiting now")
if o_flag == False:
print "using default outfile name ",output_filename
if count_flag == False:
kcount = 10000000
return output_filename, k_clust,kcount
Everything is working on fine except the -l flag so if my command line command is this: 一切正常,除了-l标志,所以如果我的命令行命令是这样的:
$python foo.py -o foo.txt -k 2 -l 2
and the print argv prints 和打印argv打印
ARGV : ['-o', 'demo.txt', '-k', '2', '-l', '2']
but the options is: 但选项是:
options [('-o', 'demo.txt'), ('-k', '2'), ('-l', '')]
Notice that nothing is being parsed in the "l" field. 请注意,“l”字段中没有任何内容被解析。 Wat am i doing wrong?
我在做错了吗? Thanks
谢谢
getopt
is a rather old module. getopt
是一个相当古老的模块。 If you have Python2.7, use argparse . 如果你有Python2.7,请使用argparse 。 If you have a slightly older version of Python >= 2.3, you can still install argparse :
如果你有一个稍微旧版本的Python> = 2.3,你仍然可以安装argparse :
With 同
import argparse
parser=argparse.ArgumentParser()
parser.add_argument('-o', help = 'outputfile')
parser.add_argument('-k', help = 'number of clusters')
parser.add_argument('-l', help = 'data to be clustered')
args=parser.parse_args()
print(args)
running 赛跑
test.py -o foo.txt -k 2 -l 2
yields 产量
Namespace(k='2', l='2', o='foo.txt')
It's because in your shortopts parameter: 'o:v:k:l', the "l" needs to be followed by a colon ":" 这是因为在你的shortopts参数:'o:v:k:l'中,“l”后面跟一个冒号“:”
Since it's not, the "2" is being put into the remainder variable. 既然不是,则将“2”放入余数变量中。
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