# 嵌套循环 def test(): for i in range(5): for j in range(6): print(f"{i} ", end='') print('') # 换行 # Main if __name__ == '__main__': test()
代码测试2:
# 九九乘法表 def test2(): for i in range(1, 10): for j in range(1, i): # print(f"{i}*{j}={i * j}", end=' ') print("{0}*{1}={2}".format(i, j, i*j), end=' ') print("") # Main if __name__ == '__main__': test2()
代码测试3:
# 表格 def test3(): staff1 = dict(name='高小一', age=20, salary=30000, city='北京') staff2 = dict(name='高小二', age=19, salary=20000, city='上海') staff3 = dict(name='高小幺', age=18, salary=10000, city='深圳') table = [staff1, staff2, staff3] for x in table: if x.get("salary") > 15000: print(x) # Main if __name__ == '__main__': test3()
while True: if 退出条件: break
while, for 循环可以附带一个else语句(可选)。如果for,while语句没有被break语句结束,则会执行else字句,否则不执行。语法格式如下:
while 条件表达式: 循环体 else: 语句块 for 变量 in 可迭代对象: 循环体 else: 语句块
三个原则提高代码的运行效率: