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Count the number occurrences of a character in a string
...quently, check out collections.Counter:
from collections import Counter
my_str = "Mary had a little lamb"
counter = Counter(my_str)
print counter['a']
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Encrypt & Decrypt using PyCrypto AES 256
...rt Random
from Crypto.Cipher import AES
class AESCipher(object):
def __init__(self, key):
self.bs = AES.block_size
self.key = hashlib.sha256(key.encode()).digest()
def encrypt(self, raw):
raw = self._pad(raw)
iv = Random.new().read(AES.block_size)
...
Change name of folder when cloning from GitHub?
...
You can do this.
git clone https://github.com/sferik/sign-in-with-twitter.git signin
refer the manual here
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App inventor可以在不开发拓展的情况下实现实时定位与导航吗？ - App应用开...
...可以实现，不过国内访问稳定性不保证：https://bbs.tsingfun.com/thread-1786-1-1.html
高德地图API也可以实现电子围栏功能，需要自己研究：https://bbs.tsingfun.com/thread-1592-1-1.htmlApp Inventor 2 发表于 2024-10-31 20:52
原生地图组件可以实...
Batch file to delete files older than N days
... with hundreds of lines of code, and others that required installing extra command line utilities to accomplish the task.
2...
How to set a Django model field's default value to a function call / callable (e.g., a date relative
...ease note that since Django 1.7, usage of lambda as default value is not recommended (c.f. @stvnw comment). The proper way to do this is to declare a function before the field and use it as a callable in default_value named arg:
from datetime import datetime, timedelta
# default to 1 day from now
...
Android SDK manager won't open
...
OK I figured it out. In my case it means going to Computer -> Advanced system settings -> Environment variables -> PATH -> edit: make sure they are in this order: C:\Program Files\Java\jdk1.7.0_11\bin;%SystemRoot%\system32;....
– Hải Phong...
How can I use pointers in Java?
...leo = new Lion();
Tiger tony = (Tiger)leo; // Always illegal and caught by compiler.
Animal whatever = new Lion(); // Legal.
Tiger tony = (Tiger)whatever; // Illegal, just as in previous example.
Lion leo = (Lion)whatever; // Legal, object whatever really is a Lion.
Pointers in C:
void main()...
How can I build multiple submit buttons django form?
...und a solution that works for me: I wrote MultiRedirectMixin.
from django.http import HttpResponseRedirect
class MultiRedirectMixin(object):
"""
A mixin that supports submit-specific success redirection.
Either specify one success_url, or provide dict with names of
submit action...