print('-- for example')
l = ['Apple', 100, 15.23]
for i in l:
print(i, type(i))
print('-- dictionary')
d = {"Apple":100, "Orange":200, "Banana":300}
for k, v in d.items(): #print dictionary
print(k, v)
print('-- iterator')
l = [10, 20, 30]
iterator = iter(l)
for i in iterator:
print(i)
print('-- 9*9 ')
for n in [1, 2, 3, 4, 5, 6, 7, 8, 9]:
print("-- {0} step --".format(n))
for i in [1, 2, 3, 4, 5, 6, 7, 8, 9]:
print("{0} * {1} = {2}".format(n, i, n*i))
print('-- break, continue and else example')
l = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for i in l:
if i > 5:
break
print("Item:{0}".format(i))
for i in l:
if i % 2 == 0:
continue
print("Item: {0}".format(i))
for i in l:
if i > 5:
break
print("Item:{0}".format(i))
else:
print("Exit without break")
print("Always this is printed")
print("-- useful function")
list( range(10) )
#[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
list( range(5,10) )
#[5, 6, 7, 8, 9]
list( range(10, 0, -1))
#[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
list( range(10, 20 , 2))
#[10, 12, 14, 16, 18]
for i in range(10, 20, 2):
print(i)
print("-- to get index and value concurrently")
l = ['Apple', 'orange', 'Banana']
for i in range(len(l)):
print("index:{0}, value:{1}".format(i, l[i]))
print("-- enumerate example")
l = ["Apple", 100, 15.5]
for i in enumerate(l):
print(i)
for i in enumerate(l, 300):
print(i)
#list comprehensions
l = [1, 2, 3, 4, 5]
print( [i ** 2 for i in l] )
#[1, 4, 9, 16, 25]
t = ("apple", "banana", "orange")
print( [len(i) for i in t] )
#[5, 6, 6]
d = {100:"apple", 200:"banana", 300:"orange"}
print( [v.upper() for v in d.values() ] )
print( [i ** 3 for i in range(5)] )
#[0, 1, 8, 27, 64]
print( [i for i in t if len(i) > 5 ] )
#['banana', 'orange']
l1 = [3, 4, 5]
l2 = [1.5, -0.5, 4]
print( [x*y for x in l1 for y in l2 ] )
#[4.5, -1.5, 12, 6.0, -2.0, 16, 7.5, -2.5, 20]
print("-- filter example")
l=[10, 25, 30]
IterL = filter(None, l)
for i in IterL:
print("Item: {0}".format(i))
def GetBiggerThan20(i):
return i > 20
print("---")
IterL = filter(GetBiggerThan20, l)
for i in IterL:
print("Item: {0}".format(i))
print("using lambda")
IterL = filter(lambda i: i>20, l)
for i in IterL:
print("Item: {0}".format(i) )
print("-- zip")
X = [10, 20, 30]
Y = ['A', 'B', 'C']
for i in zip(X, Y):
print("Item: {0}".format(i))
RetList = list(zip(X,Y))
[(10, 'A'), (20, 'B'), (30, 'C')]
#unzip
X2, Y2 = zip(*RetList)
X = [10, 20, 30]
Y = "ABC"
Z = (1.5, 2.5, 3.5)
RetList = list(zip(X, Y, Z))
print("another example for zip")
X = [10, 20, 30]
Y = "ABCD"
RetList = list(zip(X, Y))
#[(10, 'A'), (20, 'B'), (30, 'C')]
print("-- map function example")
L = [1, 2, 3]
def Add10(i):
return i+10
for i in map(Add10, L):
print("Item: {0}".format(i) )
RetList = list( map((lambda i: i+10), L))
print(RetList)
X = [1, 2, 3]
Y = [2, 3, 4]
RetList = list(map(pow, X, Y))
print(RetList)
print("--join function example")
l = ['Apple', 'Orange', 'Banana']
for i in l:
print(i)
#--> join form
print("\n".join(l))
print("-- processing time compare with noraml print and joint")
import time
l = range(1000)
t = time.mktime(time.localtime())
for i in l:
print(i, )
t1 = time.mktime(time.localtime()) - t
t = time.mktime(time.localtime())
print(",".join(str(i) for i in l))
t2 = time.mktime(time.localtime()) - t
print("for -> Take {0} seconds".format(t1))
print("join -> Take {0} seconds".format(t2))
#result is 0.0 second both.. -.-