Thank you. That gave so much solutions.
And thanks all.
Steven D'Aprano 写道:
> On Tue, 22 Jan 2008 11:00:53 +0800, J. Peng wrote:
>
>> first I know this is the correct method to read and print a file:
>>
>> fd = open("/etc/sysctl.conf")
>> done=0
>> while not done:
>> line = fd.readline()
>> if line == '':
>> done = 1
>> else:
>> print line,
>>
>> fd.close()
>
>
> The evolution of a Python program.
>
> # Solution 2:
>
> fd = open("/etc/sysctl.conf")
> done = False
> while not done:
> line = fd.readline()
> if line:
> print line,
> else:
> done = True
> fd.close()
>
>
>
> # Solution 3:
>
> fd = open("/etc/sysctl.conf")
> while True:
> line = fd.readline()
> if line:
> print line,
> else:
> break
> fd.close()
>
>
> # Solution 4:
>
> fd = open("/etc/sysctl.conf")
> lines = fd.readlines()
> for line in lines:
> print line,
> fd.close()
>
>
> # Solution 5:
>
> fd = open("/etc/sysctl.conf", "r")
> for line in fd.readlines():
> print line,
> fd.close()
>
>
> # Solution 6:
>
> for line in open("/etc/sysctl.conf").readlines():
> print line,
> # garbage collector will close the file (eventually)
>
>
> # Solution 7:
>
> fd = open("/etc/sysctl.conf", "r")
> line = fd.readline()
> while line:
> print line,
> line = fd.readline()
> fd.close()
>
>
> # Solution 8:
>
> fd = open("/etc/sysctl.conf", "r")
> for line in fd:
> print line,
> fd.close()
>
>
> # Solution 9:
>
> for line in open("/etc/sysctl.conf"):
> print line,
>
>
> # Solution 10:
> # (the paranoid developer)
>
> try:
> fd = open("/etc/sysctl.conf", "r")
> except IOError, e:
> log_error(e) # defined elsewhere
> print "Can't open file, please try another."
> else:
> try:
> for line in fd:
> print line,
> except Exception, e:
> log_error(e)
> print "Reading file was interrupted by an unexpected error."
> try:
> fd.close()
> except IOError, e:
> # Can't close a file??? That's BAD news.
> log_error(e)
> raise e
>
>
>
>
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