1. UnicodeDecodeError: ‘ascii’ codec can not decode byte 0xe9 in position 0: ordinal not in range(128))

    import sys
    reload(sys)
    sys.setdefaultencoding('utf8')
    
  2. 启动HTTP服务

    cd specific_dir_containing_an_index.html
    python -m SimpleHTTPServer 11521 # 11521 as port number
    
  3. Generate a combination for all elements in a 2-d list.

    def iterateLists(optL, resultL, recordL=[]):
        '''
        optL = [
                ["-p prot1", "-p prot2", "-p prot3"], 
                ["-l chem1", "-l chem2"], 
                ["-o result"]
               ]
           
        recordL: tmp record variable
       
        resultL = [
            ["-p prot1", "-l chem1",  "result"], 
            ["-p prot1", "-l chem2",  "result"]
        ]
       
        '''
        if debug:
            print >>sys.stderr, "New"
            print >>sys.stderr, optL
            print >>sys.stderr, recordL
        for opt in optL[0]:
            newOptL = optL[1:]
            if len(newOptL) > 1:
                tmpL = recordL[:]
                tmpL.append(opt)
                if debug:
                    print >>sys.stderr, "Next"
                    print >>sys.stderr, newOptL
                    print >>sys.stderr, tmpL
                iterateLists(newOptL, resultL, tmpL)
            else:
                for last_opt in newOptL[0]:
                    tmpL = recordL[:]
                    tmpL.append(opt)
                    tmpL.append(last_opt)
                    resultL.append(tmpL)
    #------------------------------------
    a = a = [[1],  [2,  3],  [4,  5],  [6]]
    resultL = []
    iterateLists(a, resultL)
    resultL
    [[1, 2, 4, 6], [1, 2, 5, 6], [1, 3, 4, 6], [1, 3, 5, 6]]
    
  4. Check if system command runs successfully

    if os.system(cmd):
        print >>sys.stderr, cmd + ' failed'
        sys.exit(1)
    
  5. 获取软连接的绝对路径

os.path.realpath("link_file")
  1. 获得文件大小
os.path.exists(file)
os.stat(file).st_size
  1. 调用系统命令,并指导timeout
from subprocess32 import call, TimeoutExpired
cmd = ['cmd', '-p1', 'p1value', '-p2', 'p2value']
try:
	call(cmd, timeout=5)
except TimeoutExpired:
	print >>sys.stderr, "Time out"
  1. Python mail
msg = MIMEMultipart()  
msg['From'] = "%s<%s>" % (Header("易生信培训", "utf-8"), "train@ehbio.com")
msg['To'] = '1@ehbio.com, 2@ehbio.com'
msg['Cc'] = '3@ehbio.com'

mailServer.sendmail(gmailUser, ['1@ehbio.com', '2@ehbio.com', '3@ehbio.com'],  msg.as_string()) 

  1. multiple thread
from multiprocessing.dummy import Pool
from functools import partial
from subprocess import call
pool = Pool(10) # 10 threads
# pool.map(func, iteratable)
pool.map(partial(call,  shell=True),  cmdL)
pool.close()
pool.join


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