我用这个python shell生成一个字符串:
>>>':'.join("{:x}\n".format(random.randint(0, 2**16 - 1)) for i in range(4))
当我在Python2.7.5中运行这个shell时,一切都顺利.但它发生ValueError: zero length field name in format在Python版本时2.6.6.当Python版本出现时,我该怎么办这个shell 2.6.6呢？
最近,我正在学习argparse模块,代码下面发生了Argument错误
import argparse
import sys
class ExecuteShell(object):
def create(self, args):
"""aaaaaaa"""
print('aaaaaaa')
return args
def list(self, args):
"""ccccccc"""
print('ccccccc')
return args
def delete(self, args):
"""ddddddd"""
print('ddddddd')
return args
class TestShell(object):
def get_base_parser(self):
parser = argparse.ArgumentParser()
parser.add_argument('-h',
'--help',
action='store_true',
help=argparse.SUPPRESS)
parser.add_argument('-c', action='store',
dest='create_value',
help='create a file')
parser.add_argument('-d', action='store',
dest='delete_value',
help='delete a file')
parser.add_argument('-l', action='store',
dest='list_value',
help='list a dir')
return parser
def _find_actions(self, subparsers, actions_module):
for attr in (action for action in dir(actions_module) if not action.startswith('__')):
callback = getattr(actions_module, attr)
desc = …在Python中,如果我想以IP地址的形式生成随机字符串,该怎么办？
例如:"10.0.1.1","10.0.3.14","172.23.35.1"等.
有人可以给我一些帮助吗？
我按照这个URL创建了一个X509证书.代码是:
from OpenSSL import crypto, SSL
from socket import gethostname
from pprint import pprint
from time import gmtime, mktime
CERT_FILE = "selfsigned.crt"
KEY_FILE = "private.key"
def create_self_signed_cert():
# create a key pair
k = crypto.PKey()
k.generate_key(crypto.TYPE_<wbr>RSA, 1024)
# create a self-signed cert
cert = crypto.X509()
cert.get_subject().C = "UK"
cert.get_subject().ST = "London"
cert.get_subject().L = "London"
cert.get_subject().O = "Dummy Company Ltd"
cert.get_subject().OU = "Dummy Company Ltd"
cert.get_subject().CN = gethostname()
cert.set_serial_number(1000)
cert.gmtime_adj_notBefore(0)
cert.gmtime_adj_notAfter(10*<wbr>365*24*60*60)
cert.set_issuer(cert.get_<wbr>subject())
cert.set_pubkey(k)
cert.sign(k, 'sha1')
open(CERT_FILE, "wt").write(
crypto.dump_certificate(<wbr>crypto.FILETYPE_PEM, cert)) …>>>import struct
>>>size_a = struct.calcsize('10s')
size_a = 10
>>>size_b = struct.calcsize('iii')
size_b = 12
>>>size_c = struct.calcsize('10siii')
size_c = 24
有人能告诉我为什么size_c 24而不是22(10 + 12)？
haproxy如何处理静态文件（如.css，.js，.jpeg）？当我使用配置文件时，浏览器会说：
503服务不可用
没有服务器可用于处理此请求。
这是我的配置：
global
daemon
group root
maxconn 4000
pidfile /var/run/haproxy.pid
user root
defaults
log global
option redispatch
maxconn 65535
contimeout 5000
clitimeout 50000
srvtimeout 50000
retries 3
log 127.0.0.1 local3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
listen dashboard_cluster :8888
mode http
stats refresh 5s
balance roundrobin
option httpclose
option tcplog
#stats realm Haproxy \ statistic
acl url_static path_beg -i /static
acl url_static path_end -i .css .jpg …我安装了一个postfix邮件服务器.但是当我使用thunderbird登录用户时,这是错误的.这是配置.
postconf -n:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
home_mailbox = Maildir/
html_directory = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailbox_size_limit = 20000000000
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 200000000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = stack.daolicloud.com
myhostname = mail.stack.daolicloud.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix …我想定义一个函数,检查一个字符串是否包含在中文中.例如,check_contain_chinese("中国"),它返回True.check_contain_chinese('xx中国'),它返回True,check_contain_chinese("xxx"),返回False.有人可以给我一些建议吗？我是大一新生..
我建立了一个名为"mysite"的django项目.我的urls.py是
from django.conf.urls import patterns, include, url
from .views import WelcomeView
urlpatterns = patterns('',
url(r'^$', WelcomeView.as_view(), name='welcome'),
)
我的views.py是:
from django.views import generic
class WelcomeView(generic.TemplateView):
template_name = 'templates/welcome.html'
目录结构是
+/home/mysite
- manage.py
- static
+ mysite
- views.py
- urls.py
- settings.py
- __init__.py
+ templates
- welcome.html
当我跑:
python manage.py runserver
我的浏览器说:"TemplateDoesNotExist at templates/welcome.html".有人可以帮帮我吗？非常感谢 !
Python 2.7.5 (default, Sep 12 2013, 12:43:04)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/urllib.py", line 33, in <module>
from urlparse import urljoin as basejoin
File "/usr/local/lib/python2.7/urlparse.py", line 118, in <module>
from collections import namedtuple
File "/usr/local/lib/python2.7/collections.py", line 9, in <module>
from operator import itemgetter as _itemgetter, eq as _eq
ImportError: cannot import name itemgetter …