Error Handling

Exception handling

try:
    f = open("test")
    for line in f:
        print line
except :
    f = open("test.txt")
    for line in f:
        print line

try:  
    f = open("test.txt")
except :
    print "Cannot open the input file"
    raise SystemExit
else:
    for line in f:
      print line

def main(data):
    print data

try:
    import sys
    data = sys.argv[1]
except :
    print "<usage: python my_script.py arg1>"
    raise SystemExit
else:
    main(data)

Built-in exceptions

slot

def main(data):
    print data

try:
    import sys
    data = sys.argv[1]
except ImportError:
    print "<usage: python my_script.py arg1>"
    raise SystemExit
else:
    main(data)

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