python第七天 for和while循环

一、访问 [(1, 100), (2, 20), (3, 30)] 列表中元组的每个元素

（使用for 循环和 while 循环）

for循环
# list_data = [1, 2, 3, 4] 
""" 
for temp_variable_name in iterable(可迭代的对象): 
    要执行的语句 
break: 终止
continue：跳过当前循环 

temp_varible_name = list_data[0] 
temp_varible_name = list_data[1] 
temp_varible_name = list_data[2] 
temp_varible_name = list_data[3] 

# """ 
# list_data = [1, 2, 3, 4] 
# for i in list_data: 
# print(i) 
#
#
# for i in range(0, 10, 2): 
#     print(i) 
#
# for i in range(10): #默认的start=0, step=1 
#     print(i) 
#
# for i in range(0, 10): #默认step=1 
# print(i)
 
# help(range)

""" 
range(stop) -> range object 
range(start, stop[, step]) -> range object 
"""
# print(80 * "*") 
# list_data = [1, 2, 3, 4] 
# print("list--------------") 
# for i in list_data: 
#     print(i) 
# tuple_data = (1, 2, 3, 4) 
# print("tuple--------------") 
# for i in tuple_data: 
#     print(i) 
# dict_data = {1: 2, 2: 3, 3: 4} 
# print("dict]-----------------") 
# for i in dict_data: 
#     print(i) 
# for i in dict_data.keys(): 
#     print(i) 
# for i in dict_data.values(): 
#     print(i) 
# for i in dict_data.items(): 
#     print(i) 
#
# #(1, 2), (2, 3), (3, 4) 
# for k, v in dict_data.items(): 
# print(k, v) 
#
# list_data[0] 
# list_data[1] 
#
# help(enumerate) 
#
# for index, value in enumerate(list_data): 
#     print(index, value)
#

while循环
while condition: 
   要执行的语句 
condition: True or False, 只有条件为False循环终止， 为True继续执行 
""" 
i = 0 
while i < 10: 
      print(i) 
      i = i + 1 

i = 1 
while i < 10: 
      j = 1 
      while j <= i: 
            print(i , "*", j, "=", i * j, end="t") 
            j = j + 1 
     i = i + 1 
     print() 
i = 1 
while i < 10: 
      print(i)

二、打印 9*9 乘法表

1、使用双层 for 循环实现

2、使用双层 while 循环实现

3、使用单层 while 循环实现

def print(self, *args, sep=' ', end='n', file=None): 
*args: 代表可以传入多个参数 
sep: separator，分隔符 
end: 结尾符号