This script checks if command-line argument 'n' has been passed; if not, it sets it to the user-defined default value.
Python, 36 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | import sys
def isint(x):
try:
x = int(x)
return 1
except:
return 0
def isarg(pos):
try:
temp = sys.argv[pos]
temp = 1
except:
temp = 0
return temp
def setarg(pos, val):
if isarg(pos):
if isint(sys.argv[pos]):
return int(sys.argv[pos])
else:
return sys.argv[pos]
else:
sys.argv.append(str(val)) # str(val) is used, because by default all arguments are strings
if isint(sys.argv[len(sys.argv)-1]):
return int(sys.argv[len(sys.argv)-1])
else:
return sys.argv[len(sys.argv)-1]
## usage : FileNameToProcess = setarg(1, "default.txt")
## Explanation:
## if there is an argument at sys.argv[1], return that value;
## if not, sys.argv[1] to "default.txt"
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(I intend to write a more complex, more concise script based on the above.)
