2021-09-29-Learning notes P-3, Python

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Forrest
 

        In python, the annotaion should start with charactor '#'. Then you could note down anything you want about your program. The caution will still be just in one row, if your note is over one row, you should always add '#' in front of your notes.

        Let's see an example.

# this program intend to set a program to draw sth
# so firstly we use 'import' key word to import the 'turtle' class
# I assume 'turtle' is a class according to my experience of Java programming, as
# we all know, Java is an kind of objective programming language.
# so 't = turtle.Pen()' means to give birth to object 't' with a function of class
# , then 'Pen()' should be a method for initialize 't'.
#
# @Forrest
import turtle
t = turtle.Pen()

# this is a formal for circle.
# as we all know, in C language, 'for' should be this way:
# for(x = 0, x > -100, x++) {
#      .........
#}
# so x = 0 is the key, x > -100 is the loop condition, x++ is after program finish
# doing the stuff in brackets, will do this step definitely.

for x in range(360):
    t.forward(x)
    t.left(59)

#so in C, this means
# for(x = 0, x < 360, x++) {
#   t.forward(x)
#   t.left(59)
#}

#in this program, you could adjust the value of 'x' to make the picture looks differently.

        Let's show the code directly. By the way, in this part, there is no 'for circle' / ' variable defination'... which means people might be interested in this part, intend to improve their interest.

Figure1:My first graph by python, it's an alphabet 'F'