from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"
my_list = ["apple", "banana", "carrot", "dragonfruit"]
my_list
enumerate(my_list)
type(enumerate(my_list)) # enumerate
e1_list = list(enumerate(my_list)) # list of tuples returned when enum converted to list
e1_list
e1_list[0]
type(e1_list[0]) # tuple
# change starting position of index from 0 to 11
list(enumerate(my_list, 11))
Loop over an enum
# prefer to use pos, element instead of a, b
for a, b in enumerate(my_list):
# a is int, b is str
print("###")
print(a)
print(type(a))
print(b)
print(type(b))
for a in enumerate(my_list):
# b is optional
# if b not mentioned, a is a tuple
print("###")
print(a)
list(range(10))
[x for x in range(10)]
[range(10)] # weird, avoid.
itertools¶x = 4
x = 5
x = 10
if(x>5):
print("greater than five")
elif(x<5):
print("less than five")
elif(x==5):
print("equals five")
# else if does not work, use elif
age = list(range(10,51,10))
['young' if x < 15 else 'old' for x in age]
['young' if (x < 15) else 'middleage' if (x < 35) else 'old' for x in age]
# [a if condition_1 else b if condition_2 else c for _ in _]
np.where()
# does not readily exist in python
my_num = list(range(0,51,10))
for x in my_num:
print(x)
x
for x in my_num:
print(x)
if x>30:
break
for x in my_num:
if x==30:
continue
print(x)
for x in range(5):
print(x)
del x
i = 0
while(i < 5):
print(i)
i = i + 1
i = 0
while 1:
print(i)
i = i + 1
if(i==5):
break