- STRINGS
- INPUT/OUTPUT: print input
- COMPARISON OPERATORS ON int,float, string
- LOGIC OPERATORS ON bools
- CONTROL FLOW - BRANCHING
这是MIT的第二节公开课，讲的都是基础的python语法知识，虽然这些语法都知道，但还是坚持把这节课听完，一可以锻炼听力也可以学点专业名次，二，这么简单的课程都不能坚持听完，更别说计划中都算法课了。
STRINGS
- enclose in quotation marks or single quotes
- concatenate strings
- do some operations on a string as defined in Python docs
INPUT/OUTPUT: print input
print("my fav num is", x, ".", "x =", x)
print("my fav num is " + x_str + ". " + "x = " + x_str)
num = int(input("Type a number... "))
print(5*num)
input gives you a string so must cast if working with numbers
COMPARISON OPERATORS ON int,float, string
LOGIC OPERATORS ON bools
not a True if a is False False if a is True a and b True if both are True a or b True if either or both are True
CONTROL FLOW - BRANCHING
if while for