javascript:switch-caseで不等号

switch-caseで不等号による条件分岐。

var answer=prompt("How old are you?")
switch(true){
    case answer<20:
        console.log("you are under " + answer)
        break;
    case answer<30:
        console.log("you are under "+ answer)
        break;
    case answer<40:
        console.log("you are under "+ answer)
        break;
    default:
        console.log("have fun")
}

python: Dictionary .item()

x = {"a": "apple","b": "bee","c": "cat"}
print x.items()

>>> [('a', 'apple'), ('c', 'cat'), ('b', 'bee')]

python: lambda

my_list=range(10)
print filter(lambda x:x%2==0,my_list)

[0, 2, 4, 6, 8]

python: list slicing

lst = [i ** 3 for i in range(1, 101)]
print lst[2:51:2]

python: list generator

lst = [x for x in range(100) if x % 3 == 0]
print lst

[0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99]

python : for x not in list/text

for x not in [list]

for x not in "text"

python zip

list_1 = [3, 9, 12, 15, 18]
list_2 = [2, 4, 8, 16, 32]

for a, b in zip(list_1, list_2):
    if a>b:
        print "a is bigger"
    elif b>a:
        print "b is bigger"
    else:
        print "a is equal to b"

python: enumurate

choices = ['soccer', 'tennis', 'basketball', 'balleyball']

print 'Your choices are:'
for index, item in enumerate(choices):
    print index+1, item

python:range()

range(5) # => [0,1,2,3,4]
range(1,5) # => [1,2,3,4]
range(1,5,3) # => [1,4]

python_removal from list

list.pop(index)
list.remove(item)
del(list[index])

python function

def square_cal(length,width):
    return length*width

def square(length,width):
    if length==width:
        return  square_cal(length,width)
    else:
        return "Not square"

python %s %d %f %d

%s: 文字列
%d: 整数値
%f: 浮動小数点数
%x: 16進整数

python: raw_input()

name=raw_input("Your name is ")
print name

python: print "%.2f" %var

var=1.234567
print "%.2f" %var
print "%.3f" %var
print "%.4f" %var
print "%.5f" %var

1.23

1.235

1.2346

1.23457