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li = ['alex','wusir','rain']
s1 = '*'.join(li)
print(s1)
1-2+3-4+5.......+99
sum = 0
for i in range(1,100):
if i % 2 == 0:
sum = sum - i
else:
sum += i
12,使用range打印100,99,98,....1,0(2分)
for i in range(100,-1,-1):
print(i)
count = 0
content = input('>>>')
for i in range(len(content)):
if i % 2 == 1 and content[i].isdigit():
count += 1
print(count)
'''
16,实现一个整数加法计算器:(6分)
如:content = input(‘请输入内容:’) # 如用户输入:5+8+7....(最少输入两个数相加),然后进行分割再进行计算,将最后的计算结果添加到此字典中(替换None):
dic={‘最终计算结果’:None}。
'''
content = input('请输入内容:') # 5+8+7。。。
content_list = content.split('+')
print(content_list)
sum = 0
for i in content_list:
sum = sum + int(i)
print(sum)
i = '7 '
print(int(i.strip()))
li = [11,22,33,44,55,77,88,99,90]
result = {'key1':[],'key2':[]}
for row in li:
li = [11,22,33,44,55,77,88,99,90]
result = {}
for row in li:
if row > 66:
if 'key1' not in result:
result['key1']=[]
result['key1'].append(row)
else:
if 'key2' not in result:
result['key2']=[] # result = {'key2':[]}
result['key2'].append(row)
print(result)
li = [11,22,33,44,55,77,88,99,90]
result = {}
for row in li:
result.setdefault('key1',[])
result.setdefault('key2',[])
if row > 66:
result['key1'].append(row)
else:
result['key2'].append(row)
user_list = [
{'username':'barry','password':'1234'},
{'username':'alex','password':'asdf'},
]
board = ['张三','李小四','王二麻子']
while 1:
username = input('用户名:')
if username.upper() == 'Q':break
password = input('密码:')
for i in board:
if i in username:
username = username.replace(i,'*'*len(i))
user_list.append({'username':username,'password':password})
print({'username':username,'password':password})
print(user_list)