jay-zhuang

# sudo the previous command
sudo !!
# for example, apt-get will failed because current user is not root
apt-get install vim
sudo !!
# !! will be replaced with previous command, enter enter again to run

jay-zhuang

# show more lines with -C
grep -C 2 "test" temp.log
# If there's a match, it will show two more lines before and
# after the match line.
# -A is for after, -B is for before
# -n : show the line number
# -l : just show the filename
# -i : case insesentive search
# -w : match the word
# -c : show the count number

jay-zhuang

str = "This is Jason, I'm a programmer."
if str.find("Jason") != -1:
    foundYou = True
    
# Here is the Python way to do that:
if "Jason" in str:
    foundYou = True

jay-zhuang

a = foo();
b = bar();

jay-zhuang

if myName:
    # myName is exist and not empty
    print "Hello " + myName
else:
    print "Please input your name"

jay-zhuang

class customersSystem
    def say_hello():
        if customer_name and customer_name in customer_list:
            print "hello " + customer_name

        # the code needs to be change and it is longer than 80
        if customer_name and customer_name in system_database.get_customer_list():
            print "hello" + customer_name

        # To format this code, "=" will not help you.

jay-zhuang

# overrider the class functions for test only
MyClass.ConnectServer = lambda *a, **kw: None

# simple lambda functions to override real function 
def test_connection():
    run_connection_fun(lambda: False)
    run_connection_fun(lambda: True)
    
def run_connection_fun(connect_fun)
    pass

jay-zhuang

sorted(customers, key=lambda c: c.name.last)

reduce(lambda x, y: x.balance + y.balance, customers)

map(lambda x: x*x*x, range(1, 11))
# [1, 8, 27, 64, 125, 216, 343, 512, 729, 1000]

filter(lambda x: x%2 != 0 and x%3 != 0, range(2, 25))
# [5, 7, 11, 13, 17, 19, 23]

jay-zhuang

.
|-- prj1
|-- prj2
|-- prj3
|-- prj4
`-- tags

jay-zhuang

                                         Processing response from /ip1         |           5497 |                  SharedPool-Worker-318
                                  Sending read-repair-mutation to /ip1         |           5628 |                  SharedPool-Worker-380
                                   Sending READ_REPAIR message to /ip1         |           5681 | MessagingService-Outgoing-/ip1
                                READ_REPAIR message received from /ip1         |           5809 | MessagingService-Incoming-/ip1
Timed out while read-repairing after receiving all 6 data and digest responses |        2005779 |                  SharedPool-Worker-380