任务一：

# 统计指定字符出现的次数
def get_count(s, ch):
    count = 0
    for item in s:
        if ch.upper() == item or ch.lower() == item:
            count += 1
    return count
if __name__ == '__main__':


    s = 'hellopython, hellojava, hellogo'
    ch = input('请输入要统计的字符：')
    count = get_count(s, ch)
    print(f'{ch}在{s}中出现的次数为:{count}')

任务二：

def show(lst):
    for i in lst:
        for item in i:
            print(item, end='\t\t')
        print()

lst = ['01', '电风扇', '美的', 500], ['02', '洗衣机', 'TCL', 1000], ['03', '微波炉', '老板', 400]
print('编号\t\t名称\t\t\t品牌\t\t单价')
show(lst)
print('------------------字符串的格式化-------------------------')
print('编号\t\t\t名称\t\t\t品牌\t\t单价')
for i in lst:
    i[0] = '0000' + i[0]
    i[3] = '￥{:.2f}'.format(i[3])
show(lst)