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. 调用系统指令并获得输出
from subprocess32 import check_output
output = check_output(' '.join(cmd), shell=True)
output
  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
  1. 获取文件名和目录名
head,  tail = os.path.split(" /tmp/d/a.dat" )
print(tail)
a.dat
print(head)
/tmp/d
  1. 列表死循环
for i in lineL:
	lineL.append(i)

for i in lineL[:]:
	lineL.append(i)
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