我试图理解Python2.7.10在我的脚本中的行为方式。
这就是我所拥有的：
import sys, getopt
import socket
import re
import pprint
class New_VM(object):
''' Class to validate options and arguments being passed in. '''
def __init__(self, argv):
# Accept command line options and arguments being passed in to the script.
# Options are being held in the opts data structure.
# Arguments are being held in the args data structure.
try:
opts, args = getopt.getopt(argv, "hn:m:p:d:s:r:t:",["hostname=","eth0=","eth1=","defaultgw=","subnet=","route-eth0=", "rt_tables="])
#pprint.pprint(opts)
print(opts[0])
#sys.exit(2)
# Raise exception and die if invalid option is passed in.
except getopt.GetoptError:
print 'Invalid script syntax:'
print 'buildNetworkFile.py -n <hostname> -m <eth0_ip> -p <eth1_ip> -d <default_gw> -s <subnet> -r <route-eth0 file> -t <rt_tables file>'
sys.exit(2)
# Validate correct number of options/arguments are being passed in and take action accordingly.
for opt, arg in opts:
# Display help if -h option is passed or die if less than 5 options passed.
if opt == '-h' or len(opts) < 5:
#if opt == '-h':
print 'Please use syntax below to run script.'
print 'Script requires 5 arguments to be passed in.'
print 'buildNetworkFile.py -n <hostname> -m <eth0_ip> -p <eth1_ip> -d <default_gw> -s <subnet> -r <route-eth0 file> -t <rt_tables file>'
sys.exit(2)
#break
# Catch the hostname being passed in.
elif opt in ("-n", "--hostname"):
self._hostname = arg
# Validate management IP being passed in.
elif opt in ("-m", "--eth0"):
try:
self._eth0 = arg
socket.inet_pton(socket.AF_INET, self._eth0)
except AttributeError:
try:
self._eth0 = arg
socket.inet_aton(self._eth0)
except socket.error:
print 'Socket error when validating management(eth0) IP..'
#return False
except socket.error:
print 'Invalid managment(eth0) IP. Please check your IP and try again.'
sys.exit(2)
# Validate public IP being passed in.
elif opt in ("-p", "--eth1"):
try:
self._eth1 = arg
socket.inet_pton(socket.AF_INET, self._eth1)
except AttributeError:
try:
self._eth1 = arg
socket.inet_aton(self._eth1)
except socket.error:
print 'Socket error when validating public(eht1) IP..'
#return False
except socket.error:
print 'Invalid public(eth1) IP. Please check your IP and try again.'
sys.exit(2)
# Validate default gateway IP being passed in.
elif opt in ("-d", "--defaultgw"):
try:
self._dg = arg
socket.inet_pton(socket.AF_INET, self._dg)
except AttributeError:
try:
self._dg = arg
socket.inet_aton(self._dg)
except socket.error:
print 'Socket error when validating defautl gateway IP..'
#return False
except socket.error:
print 'Invalid Default Gateway IP. Please check your IP and try again.'
sys.exit(2)
elif opt in ("-s", "--subnet"):
# Validate subnet IP being passed in.
try:
self._subnet = arg
socket.inet_pton(socket.AF_INET, self._subnet)
except AttributeError:
try:
self._subnet = arg
socket.inet_aton(self._subnet)
except socket.error:
print 'Socket error when validating subnet IP..'
#return False
except socket.error:
print 'Invalid Subnet IP. Please check your IP and try again.'
sys.exit(2)
# Check if route-eth0 file is being passed in.
elif opt in ("-r", "--route-eth0"):
self._routeEth0 = arg
try:
with open(self._routeEth0) as text_file:
with open('routeEth0.txt', mode='w') as out_file:
lines = text_file.readlines()
out_file.writelines(lines)
except:
print('The route-eth0 file you specified was not found. Please try again.\n')
sys.exit(2)
# Check if rt_tables file is being passed in.
elif opt in ("-t", "--rt_tables"):
self._rtTables = arg
try:
with open(self._rtTables) as text_file:
with open('rt_tables.txt', mode='w') as out_file:
lines = text_file.readlines()
out_file.writelines(lines)
except:
print('The rt_tables file you specified was not found. Please try again.\n')
sys.exit(2)
# If no arguments are passed die. If opts[0] is equal to the script name (buildNetworkFile.py) then die.
try:
arg1 = opts[0]
sys.exit(2)
except IndexError as e:
print 'Not enough arguments passed. Please run script with -h option for syntax information.'
sys.exit(2)
def __str__(self):
return 'New_VM\'s'
@property
def hostname(self):
return self._hostname
@property
def managementIP(self):
return self._eth0
@property
def publicIP(self):
return self._eth1
@property
def defaultGW(self):
return self._dg
@property
def subnet(self):
return self._subnet
class Configure_Files(New_VM):
#def __init__(self):
#'''Special Init Class for Configure NewtorkFiles Class'''
#return None
@property
def hostname(self):
return self._hostname
# Class vars
domain = 'blah.net'
networking = 'yes'
networking_ipv6 = 'yes'
nozerconf = 'yes'
gateway = 'self._dg'
ipv6_defaultgw='2001:578:15:4801:'
ipv6_defaultdev='eth1'
hwaddr=''
mgtInterface='eth0'
pubInterface='eth1'
dns1='1.1.1.1'
dns2='1.1.1.1'
mgtDomain='blah2.net'
onBootYes='yes'
onBootNo='no'
userCtlYes='yes'
userCtlNo='No'
bootProtocol='static'
peerDnsYes='yes'
peerDnsNo='No'
ipv6InitYes='yes'
ipv6InitNo='no'
ipv6Addr='2001:578:115:4820:'
# Ask user for Management Network IP and validate it.
mgtNetwork = raw_input("Please enter the Management Network IP.\n")
try:
socket.inet_pton(socket.AF_INET, mgtNetwork)
except AttributeError:
try:
socket.inet_aton(mgtNetwork)
except socket.error:
print 'Socket error when validating subnet IP..'
except socket.error:
print 'Invalid Management Network IP. Please check your IP and try again.'
sys.exit(2)
# Ask user for Public Network IP and validate it.
pubNetwork = raw_input("Please enter the Public Network IP.\n")
try:
socket.inet_pton(socket.AF_INET, pubNetwork)
except AttributeError:
try:
socket.inet_aton(pubNetwork)
except socket.error:
print 'Socket error when validating subnet IP..'
except socket.error:
print 'Invalid Public Network IP. Please check your IP and try again.'
sys.exit(2)
@property
def provisionEth0(self):
return self._eth0
#return domain
def network(self):
''' Build the contents for /etc/sysconfig/newtork file '''
'''print 'HOSTNAME=%s' % self._hostname
print 'DOMAIN=%s' % Configure_Files.domain
print 'NETWORKING=%s' % Configure_Files.networking
print 'NETWORKING_IPV6=%s' % Configure_Files.networking_ipv6
print 'GATEWAY=%s' % self._dg'''
dg2 = re.sub('[.]',':', self._dg) # Replacing '.' with ':' so it can be appended to IPV6_DEFAULTGW var
'''print 'IPV6_DEFAULTGW=%s%s' % (Configure_Files.ipv6_defaultgw, dg2)
print 'IPV6_DEFAULTDEV=%s' % Configure_Files.ipv6_defaultdev'''
with open('network.txt', mode='w') as out_file:
out_file.writelines('HOSTNAME=%s \n' % self._hostname)
out_file.writelines('DOMAIN=%s \n' % Configure_Files.domain)
out_file.writelines('NETWORKING=%s \n' % Configure_Files.networking)
out_file.writelines('NETWORKING_IPV6=%s \n' % Configure_Files.networking_ipv6)
out_file.writelines('GATEWAY=%s \n' % self._dg)
out_file.writelines('IPV6_DEFAULTGW=%s%s \n' % (Configure_Files.ipv6_defaultgw, dg2))
out_file.writelines('IPV6_DEFAULTDEV=%s \n' % Configure_Files.ipv6_defaultdev)
def eth0Config(self):
'''Build the contents for /etc/sysconfig/network-scripts/ifcfg-eth0'''
# Grab the HWADDR from the /etc/sysconfig/network-scripts/ifcfg-eth0 file
try:
with open('/etc/sysconfig/network-scripts/ifcfg-eth0') as text_file:
for line in text_file:
try:
match = re.search(r'HWADDR=(.*)', line, re.M|re.I)
Configure_Files.hwaddr=match.group(1)
#print(match.group(1))
break
except:
print('There was no \'HWADDR\' string found in the /etc/syconfig/network-scripts/ifcfg-eth0 file.')
print('Setting HWADDR to blank')
break
#sys.exit(2)
except IOError as e:
print ('/etc/sysconfig/network-scripts/ifcfg-eth0 not found: ', e)
sys.exit(2)
'''print 'HWADDR=%s' % (Configure_Files.hwaddr)
print 'NAME=%s' % (Configure_Files.mgtInterface)
print 'DNS1=%s' % (Configure_Files.dns1)
print 'DNS2=%s' % (Configure_Files.dns2)
print 'DOMAIN=%s' % (Configure_Files.mgtDomain)
print 'ONBOOT=%s' % (Configure_Files.onBootYes)
print 'USERCTL=%s' % (Configure_Files.userCtlNo)
print 'BOOTPROTO=%s' % (Configure_Files.bootProtocol)
print 'PEERDNS=%s' % (Configure_Files.peerDnsNo)
print 'IPADDR=%s' % (self._eth0)
print 'NETMASK=%s' % (self.subnet)
print 'NETWORK=%s' % (Configure_Files.mgtNetwork)
print 'IPV6INIT=%s' % (Configure_Files.ipv6InitYes)
print 'GATEWAY=%s' % (self._dg)'''
ipv6addr2 = re.sub('[.]',':', self._eth0) # Replacing '.' with ':' so it can be appended to IPV6ADDR var
#print 'IPV6ADDR=%s%s' % (Configure_Files.ipv6Addr, ipv6addr2)
ifcfg_string = '''check_link_down () {\n return 1;\n}'''
with open('ifcfg-eth0.txt', mode='w') as out_file:
out_file.writelines('HWADDR=%s \n' % Configure_Files.hwaddr)
out_file.writelines('NAME=%s \n' % Configure_Files.mgtInterface)
out_file.writelines('DNS1=%s \n' % Configure_Files.dns1)
out_file.writelines('DNS2=%s \n' % Configure_Files.dns2)
out_file.writelines('DOMAIN=%s \n' % Configure_Files.mgtDomain)
out_file.writelines('ONBOOT=%s \n' % Configure_Files.onBootYes)
out_file.writelines('USERCTL=%s \n' % Configure_Files.userCtlNo)
out_file.writelines('BOOTPROTO=%s \n' % Configure_Files.bootProtocol)
out_file.writelines('PEERDNS=%s \n' % Configure_Files.peerDnsNo)
out_file.writelines('IPADDR=%s \n' % self._eth0)
out_file.writelines('NETMASK=%s \n' % self.subnet)
out_file.writelines('NETWORK=%s \n' % Configure_Files.mgtNetwork)
out_file.writelines('IPV6INIT=%s \n' % Configure_Files.ipv6InitYes)
out_file.writelines('GATEWAY=%s \n' % self._dg)
out_file.writelines('IPV6ADDR=%s%s \n' % (Configure_Files.ipv6Addr, ipv6addr2))
out_file.writelines(ifcfg_string)
def eth1Config(self):
'''Build the contents for /etc/sysconfig/network-scripts/ifcfg-eth1'''
# Grab the HWADDR from the /etc/sysconfig/network-scripts/ifcfg-eth1 file
try:
with open('/etc/sysconfig/network-scripts/ifcfg-eth1') as text_file:
for line in text_file:
try:
match = re.search(r'HWADDR=(.*)', line, re.M|re.I)
Configure_Files.hwaddr=match.group(1)
#print(match.group(1))
break
except:
print('There was no \'HWADDR\' string found in the /etc/syconfig/network-scripts/ifcfg-eth1 file.')
print('Setting HWADDR to blank')
break
#sys.exit(2)
except IOError as e:
print ('/etc/sysconfig/network-scripts/ifcfg-eth1 not found: ', e)
sys.exit(2)
'''print 'HWADDR=%s' % (Configure_Files.hwaddr)
print 'NAME=%s' % (Configure_Files.mgtInterface)
print 'DNS1=%s' % (Configure_Files.dns1)
print 'DNS2=%s' % (Configure_Files.dns2)
print 'DOMAIN=%s' % (Configure_Files.domain)
print 'ONBOOT=%s' % (Configure_Files.onBootYes)
print 'USERCTL=%s' % (Configure_Files.userCtlNo)
print 'BOOTPROTO=%s' % (Configure_Files.bootProtocol)
print 'PEERDNS=%s' % (Configure_Files.peerDnsNo)
print 'IPADDR=%s' % (self._eth1)
print 'NETMASK=%s' % (self.subnet)
print 'NETWORK=%s' % (Configure_Files.pubNetwork)
#print 'IPV6INIT=%s' % (Configure_Files.ipv6InitYes)
print 'GATEWAY=%s' % (self._dg)'''
ifcfg_string = '''check_link_down () {\n return 1;\n}'''
with open('ifcfg-eth1.txt', mode='w') as out_file:
out_file.writelines('HWADDR=%s \n' % Configure_Files.hwaddr)
out_file.writelines('NAME=%s \n' % Configure_Files.mgtInterface)
out_file.writelines('DNS1=%s \n' % Configure_Files.dns1)
out_file.writelines('DNS2=%s \n' % Configure_Files.dns2)
out_file.writelines('DOMAIN=%s \n' % Configure_Files.domain)
out_file.writelines('ONBOOT=%s \n' % Configure_Files.onBootYes)
out_file.writelines('USERCTL=%s \n' % Configure_Files.userCtlNo)
out_file.writelines('BOOTPROTO=%s \n' % Configure_Files.bootProtocol)
out_file.writelines('PEERDNS=%s \n' % Configure_Files.peerDnsNo)
out_file.writelines('IPADDR=%s \n' % self._eth0)
out_file.writelines('NETMASK=%s \n' % self.subnet)
out_file.writelines('NETWORK=%s \n' % Configure_Files.pubNetwork)
out_file.writelines('GATEWAY=%s \n' % self._dg)
out_file.writelines(ifcfg_string)
if __name__ == "__main__":
server = New_VM(sys.argv[1:]) # Get everything after the script name
#print str(server) + ' hostname is ' + str(server.hostname)
#print str(server) + ' management IP is ' + str(server.managementIP)
#print str(server) + ' public IP is ' + str(server.publicIP)
#print str(server) + ' Default GW IP is ' + str(server.defaultGW)
#print str(server) + ' Subnet IP is ' + str(server.subnet)
#buildFile = Configure_Files(sys.argv[1:])
#buildFile.network()
#buildFile.eth0Config()
好的，再拍一次。
我请求用户在Configure_Files类中输入原始数据。但是，即使我没有从main调用Configure_Files类，我仍然会被提示输入原始数据。
当我使用-h选项运行脚本（python buildNetworkFile.py -h）时，我立即得到提示输入原始数据，一旦我输入原始数据（只有2个IP地址），我会显示帮助信息。
如果我从Configure_Class中取出原始输入代码，那么当使用'-h'选项运行脚本时，我不会再收到提示输入原始输入。
我认为我正在搞乱某处的异常处理，但无法弄清楚在哪里。但那只是我猜测......
答案 0 :(得分：0)
根据你的解释，似乎你的代码只是在请求原始输入后“死”，因为只有在它尝试将该数据写入文件后，程序才意识到文件不存在，然后脚本失败。
尝试此操作以正确检查文件是否存在：
import os.path
os.path.exists(file_path)
如果文件或目录存在，语句os.path.exists(file_path)将返回True，否则返回False。