From Java to Python

Python: equivalent to Java toString()

In Java, overrides toString() method in the your class can change the textual representation of the object. The equivalent in Python is __st...
Python: generates crc32 and adler32 checksum for big files

import zlib import sys import urllib2 def __zlib_csum(url, func): if isinstance(url, basestring if sys.version_info[0] < 3 else str...
Python: string equals ignore case

def equals_ignore_case(s1, s2): if s1 is None and s2 is None: return True if s1 is None and s2 is not None: return ...
Python: current time in milliseconds

import time ms = int(round(time.time() * 1000)) print(ms)
python: print a string as hex bytes

':'.join(x.encode('hex') for x in 'Hello World!') Executes in python CLI: >>> ':'.join(x.en...
synchronized static method in python

Java code class AClass { private static int _count = 0; public static synchronized inc(){ _count ++; } publi...
Python: delete a item from a list

remove the first matching element: if e in list: list.remove(e) remove all occurrences: while e in list: list.remove(e) EAFP st...
Python: call constructor of the super class

Option 1: class A(object): def __init__(self): print "world" class B(A): def __init__(self): print "hello" ...
Python: mutable byte array as buffer

bytearray function can be used to make a mutable byte array as buffer: import struct buffer = bytearray(8) buffer[0]=1 buffer[1]=1 struct....
Python: overriding static method

class A: @staticmethod def m(): print "A" class B(A): @staticmethod def m(): print "B"...

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Thursday, August 28, 2014

Python: get the length of a utf-8 encoded string

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