[英]Python indentation confusion, using 4 space tabs
我有這個小腳本:
filters = []
pipes = []
check_environment()
config()
fix_syslog()
make_fifo()
def check_environment():
# check python
# check for syslog
# check for mknod
# check for root privileges
def config():
accepted_filters = ['auth', 'authpriv', 'daemon', 'cron', 'ftp', 'lpr', \
'kern', 'mail', 'news', 'syslog', 'user', 'uucp', 'local0', 'local1' \
'local2', 'local3', 'local4', 'local5', 'local6', 'local7']
accepted_priorities = ['Emergency', 'Alert', 'Critical', 'Error', \
'Warning', 'Notice', 'Info', 'Debug']
print "Entered configuration mode. Type 'help' for more information"
loop = true
while loop:
command = input(">> ")
# handle the "done" command
if command == "done":
accept = input("Are you sure you are done configuring? (yes/no) ")
if accept == "yes":
loop = false
# handle the "help" command
elif command == "help":
print "help Displays this help message"
print "new Adds a filter to the temporary list"
print "show List all current temporary filters"
print "del Remove a filter from the temporary list"
print "done Commits to the filters and continues with install"
# handles the "show" command
elif command == "show":
for x in filters:
for y in pipes:
print filters.index(x), x, y
# handles the "new" command
elif command == "new":
new_filter = input("Enter desired facility/priority (eg. kern.Error): ")
separator = new_filter.index('.')
if separator == -1:
print "You've entered an invalid facility/priority. Please try again."
return
facility = new_filter[:separator]
priority = new_filter[separator:]
if facility in accepted_filters and priority in accepted_priorities:
filters.append(new_filter)
else:
print "You've entered an invalid facility/priority. Please try again."
return
new_pipe = input("Enter desired target pipe (kernel_error_pipe): ")
if new_pipe[0] != "|":
new_pipe = "|" + new_pipe
pipes.append(new_pipe)
# handles the "del" command
elif command == "del":
print "Run 'show' to see which filters are available to delete."
which_filter = input("Insert the number of the filter to delete: ")
filters.remove(filters.index(which_filter))
pipes.remove(pipes.index(which_filter))
# all other cases
else:
print "Invalid command. Type 'help' to see a list of available commands"
def fix_syslog():
# check over variables
# backup to specified folder
# write own file with comments
def make_fifo():
# create pipe folder
# create pipes
這可能是錯誤的代碼,但是我剛剛開始調試,這是我第一次接觸Python。 我收到此錯誤:
File "./install.py", line 31
def config():
^
IndentationError: expected an indented block
一切似乎都正確縮進了,我設置了kate使制表符等於4個空格。 為什么會引發錯誤? 還有什么技巧可以避免將來發生這些情況?
函數定義后,應縮進代碼塊:
def check_environment():
# check python
# check for syslog
# check for mknod
# check for root privileges
def config():
# .. code
def check_environment():
之后只有注釋,沒有代碼。 這解釋了錯誤。 如果要使用空函數,請使用以下命令:
def check_environment():
pass
在def check_environment():
,您應該指定一些代碼,如果您現在不想執行任何操作,請使用pass
。
def check_environment():
# check python
# check for syslog
# check for mknod
# check for root privileges
pass
def config():
accepted_filters = ['auth', 'auth ....
而且,在創建列表時,由於逗號而無需使用反斜杠,只需執行以下操作:
accepted_filters = ['auth', 'authpriv', 'daemon', 'cron', 'ftp', 'lpr',
'kern', 'mail', 'news', 'syslog', 'user', 'uucp', 'local0', 'local1',
'local2', 'local3', 'local4', 'local5', 'local6', 'local7']
accepted_priorities = ['Emergency', 'Alert', 'Critical', 'Error',
'Warning', 'Notice', 'Info', 'Debug']
這不是一個錯誤,但這是一個壞習慣。
另外,您在“ local1”之后忘記了逗號(我假設您不想獲取“ local1local2”)。
缺少一個塊:
def check_environment():
做了
def check_environment():
pass
而且,由於在定義check_environment()
(和config()
)之前調用它,您將遇到進一步的錯誤。
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