Introduction to Python Programming

data_types_operators.py

my_var = 500

# Decrease 10%
my_var *= .9

# Increase 5%
my_var *= 1.05

# Return only integer of division
my_var // 3 # 166
my_var / 3  # 166.66666666666666

# Convert to integer
int(my_var)

# Convert to float
float(my_var)

# Convert to string
str(my_var) # '500'

# Type of object
type(my_var)

# Logical operators
and
or
not

3 == 3 and 9 != 0       # True
3 == 3 or 9 != 0        # True
not (3 == 3 and 9 != 0) # False

# String
my_string_1 = "Hello"
my_string_2 = "!"

len(my_string_1)  # 5
len(my_var)       # TypeError: object of type 'int' has no len()

my_string_1.islower()           # False
"brena monteiro".title()        # Brena Monteiro

"brena monteiro".count("Brena") # 0
"brena monteiro".count("brena") # 1
"brena monteiro".count("bre")   # 1

print(my_string_1 + my_string_2)  # Hello!
print(my_string_1 * 3)            # HelloHelloHello

my_string_1[0] # 'H'

"0" + "5" # '05'
0   + 5   # 5
"0" + 5   # TypeError: must be str, not int
0   + "5" # TypeError: unsupported operand type(s) for +: 'int' and 'str'

# List
my_list = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
my_list[0]   # 'Jan'
my_list[-1]  # 'Dec'
my_list[-12] # 'Jan'
my_list[12]  # IndexError: list index out of range
my_list[-13] # IndexError: list index out of range

my_list[0:3] # ['Jan', 'Feb', 'Mar']

# my_string.join(list) - Add the string between each element of the list
new_list = "\n".join(["one", "two", "three"])
print(new_list)

# one
# two
# three

# min(list) - Sorted alphabetically to get the greatest element of the list
min(my_list) # 'Apr'

# max(list) - Sorted alphabetically to get the smallest element of the list
max(my_list) # 'Sep'

# len(list) - Return the length of elements in the list
len(my_list) # 12

# sorted(list) - Sorted alphabetically
sorted(my_list) # ['Apr', 'Aug', 'Dec', 'Feb', 'Jan', 'Jul', 'Jun', 'Mar', 'May', 'Nov', 'Oct', 'Sep']

# list.append(element) - Add the element in the final of the list
my_list.append('2018') # ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec', '2018']