less = []
greater = []
for x in [1, 3, 4, 2, 8, 6]:
if x < 3:
less.append(x)
else:
greater.append(x)
print("less = ", less, "greater = ", greater)
Variable and Arguments Passing
a = [1, 2, 3, 4, ]
a
b = a
b
a.append(4)
b
Conditionals
x = -2
if x < 0:
print("It's negative")
x
y
if int(y) < 0:
print("It's negative")
elif int(x) == 0:
print("Equal to zero")
elif 0 < int(x) < 5:
print("positive but smaller than 5")
else:
print("Positive and larger than or equal to 5")
Loops
sequence = [1, 2, 0, 4, 6, 5, 2, 1]
total = 0
for value in sequence:
total += value # total = total + total
print("total = ", total)
sequence = [1, 2, None, 4, None, 5]
total = 0
for value in sequence:
if value is None:
continue
total += value
print(total)
sequence = [1, 2, 0, 4, 6, 5, 2, 1]
total_until_5 = 0
for value in sequence:
if value == 5:
break
total_until_5 += value
print(total_until_5)
While Loop
x = 256
total = 0
while x > 0:
print (x)
if total > 500:
break
total += x
print(total)
x //= 2
Range
seq = [10,20, 30, 40]
for i in range(len(seq)):
print("element %d: %d" %(i, seq[i]))
Built in sequences
Enumerate
# enumerate function
l1 = ["eat", "sleep", "repeat"]
# creating enumerate objects
obj1 = enumerate(l1)
print("Return type:", type(obj1))
print(list(enumerate(l1)))
Sorted
a = [7, 1, 2, 6, 0, 3, 2]
sorted(a)
a
print(sorted("COP2000 Python Programming"))
seq1 = ["Un", "Dos", "Tres"]
seq2 = ["One", "Two", "Three"]
zipped= zip(seq1, seq2)
list(zipped)
seq3 = [False, True]
list(zip(seq1, seq2, seq3))
for index, (a, b) in enumerate(zip(seq1, seq2)):
print(f"{index}: {a}, {b}") # https://realpython.com/python-f-strings/
Reversed
list(reversed(range(10)))
Lambda Function
def apply_to_list(some_list, f):
return [f(x) for x in some_list]
ints = [2, 4, 6, 8, 1, 3, 5]
apply_to_list(ints, lambda x: x ** 2)
Files and OS
! wget "https://www.gutenberg.org/files/76/76-0.txt" -O adventures.text