DevOps Garfield

1. What a data type?

1. string: Set of characters with letters, numbers, or symbols ( eg. numbers or numb3rs or numb3rs! )
2. integer: Numbers without a decimal point ( eg. 39 )
3. float: Numbers with a decimal ( eg. 3.9 )
4. list: Set of multiple values in a single variable name ( eg. school_subjects = [ 0, “Math”, 1, “Science”, 2, “P.E.”, 3, “Social Studies” ] )
   1. Also known as an “array”
5. tuple: Set of multiple values that cannot be changed ( eg. ( 0, “Math”, 1, “Science”, 2, “P.E” ) )
6. sequence: An ordered collection of items, capable of being accessed by index. Common sequence types in Python include lists, tuples, and strings.
7. set: An unordered collection of unique elements. It is similar to a list or tuple, but it does not allow duplicate values. Sets are useful for tasks such as removing duplicates from a sequence, testing for membership, and performing mathematical set operations like union, intersection, and difference.
8. boolean: Can only have 1 value of True or False ( eg. favorite_color = True )

A string veriable is one that contains letters and numbers as characters, like words in a sentence.

1. Use the type() function to find the current type of a variable

   x = "Hello world!"
   print(type(x))

2. You can also get the *length* of the string by using the len() function

   x = "Hello world!"
   print(len(x))

1. Use the type() function to find the current type of a variable

   x = 5
   print(type(x))

1. Use the type() function to find the current type of a variable

   x = 21.3
   print(x)
   print(int(x))

1. Booleans store the value of True or False
   1. Expressions are evaluated to one of these values

      print(10 > 9)
      print(10 == 9)
      print(10 < 9)

   2. All values are True except for the following conditions.
      1. Empty string
      2. Empty list ( We'll cover lists in the next section )
      3. Number 0
      4. Explicitly setting a value of False
      5. Expressions that evalute to False