1. Python
1.1. Syntax
1.1.1. COMMON ARITHMETIC OPERATORS
- Parentheses
():(5 / 5) + 5 - Exponent
**:65 **5 - Multiplication
*:5 * 5 - Division
/:5 / 5 - Addition
+:5 + 5 - Subtraction
-:5 - 5
1.1.2. COMMON VARIABLE OPERATIONS
Assigning a value directly to a variable:
integer_val = 5 float_val = 5.0 string_val = "5"Assigning the result of a calculation to a variable:
total = 5 + 5 average = (5 + 5 + 5) / 3
1.1.3. DISPLAYING VALUES
Displaying a value:
integer_val = 5 print(5) print(integer_val) print(5 + 5 + 5)Displaying a value's data type:
integer_val = 5 print(type(integer_val))
1.1.4. LIST OPERATIONS
Creating an empty list:
crime_rates = []Creating a list with values:
crime_rates = [749, 371, 828, 503, 1379]Appending a value to a list:
crime_rates = [] crime_rates.append(749) crime_rates.append(371)Accessing individual elements in a list:
crime_rates = [749, 371, 828, 503, 1379] cr_first = crime_rates[0] cr_third = crime_rates[2]Working with the length of a list:
crime_rates = [749, 371, 828, 503, 1379] length = len(crime_rates) last_element = crime_rates[length-1]Accessing slices of values in a list:
crime_rates = [749, 371, 828, 503, 1379] cr_slice = crime_rates[0:3] # Values at 0, 1, 2
1.2. Concepts
- When evaluating expressions, Python uses the order of operations rules from mathematics.
- Every value in Python has a data type associated with it. The common data types are:
- Strings:
"6" - Integers:
6 - Floats:
6.0
- Strings: