1 pi = 3.14159
   2 radius = 2.2
   3 # area of circle equation <- this is a comment
   4 area = pi*(radius**2)
   5 print(area)
   6 
   7 # change values of radius <- another comment
   8 # use comments to help others understand what you are doing in code
   9 radius = radius + 1
  10 print(area)     # area doesn't change
  11 area = pi*(radius**2)
  12 print(area)
  13 
  14 
  15 #############################
  16 #### COMMENTING LINES #######
  17 #############################
  18 # to comment MANY lines at a time, highlight all of them then CTRL+1
  19 # do CTRL+1 again to uncomment them
  20 # try it on the next few lines below!
  21 
  22 #area = pi*(radius**2)
  23 #print(area)
  24 #radius = radius + 1
  25 #area = pi*(radius**2)
  26 #print(area)
  27 
  28 #############################
  29 #### AUTOCOMPLETE #######
  30 #############################
  31 # Spyder can autocomplete names for you
  32 # start typing a variable name defined in your program and hit tab 
  33 # before you finish typing -- try it below
  34 
  35 # define a variable
  36 a_very_long_variable_name_dont_name_them_this_long_pls = 0
  37 
  38 # below, start typing a_ve then hit tab... cool, right!
  39 # use autocomplete to change the value of that variable to 1
  40 
  41 # use autocomplete to write a line that prints the value of that long variable
  42 # notice that Spyder also automatically adds the closed parentheses for you!