控制流语句:
1.if语句
- lines = 1543
- if lines < 1000:
- print("small")
- elif lines < 10000:
- print("medium")
- else:
- print("large")
- #medium
- #Python里面用缩进代替了{}、begin..end之类的,看起来有点怪啊,不过习惯起来还好。每一个条件语句后面都要跟:,另外elseif被简化成了elif
2.while语句
- while True:
- line = input("请输入一段字符:")
- if not line:
- break
- print("您输入的内容是:", line)
3.for..in
- for country in ["Denmark", "Finland", "Norway", "Swedan"]:
- print(country)
- contries = ["Denmark", "Finland", "Norway", "Swedan"]
- for country in contries
- print(country)
- for letter in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
- if letter in "AEIOU":
- print(letter, "is a vowel")
- else:
- print(letter, "is a consonant")