MIT6.00x Week1 lec2

MIT6.00x Week1 lec2

String

• enclose in quotation marks or single quotes
• 可以使用一个双引号或者一个单引号

hi = "hello world"
greetings = 'hello'

• 直接相加 hi + greetings
• 连续重复

3*"hyt" = "hythythyt"

• len('hyt' ) = 3
• 'hyt'[0] = h
• 'hyt'[1:3] = yt

while loop

• syntax

while<condition>:
	<expression>
	<expression>
	...

• 始终检查condition是否为true

for loop

• for loop主要是使用range

for n in range(5)
	print(n)

• range

range(start,stop,step)
range(1,10,2)