li = [11,22,33,44,55,66,77,88,99]
result = {}
for row in li:
if row >66
if 'key1' not in result:
result['key1'] = []
result['key1'].append(row)
else
result['key1'].append(row)
else
if 'key1' not in result:
result['key2'] = []
result['key2'].append(row)
#因为if内的内容只执行一次，为了避免重复代码
def func1(lis= [])
lis.append[1]
print(lis)
func()
func()
func([])
func()
func()
#如果默认参数是可变数据类型，调用时不传值的话会共享这个数据
#返回奇数位
def func(lis):
return lis[1::2]
#判断输入值长度
def func(x):
return len(x)>5
#如果输入大于两位，则返回前两位
def func(lis):
return lis[:2] #如果原列表长度小于切片位数，则会返回原列表
#统计传入字符串中的各种个数
def func(s):
dic = {'num':0, 'alpha':0, 'space':0, 'other':0}
for i in s:
if i.isdigit():
dic['num'] += 1
elif i.isalpha():
dic['alpha'] += 1
elif i.isspace():
dic['space'] += 1
else
dic['other'] += 1
return dic
###############################################
调整为下面格式：
list3 = [
{'name':'alex','hobby':'抽烟'},
{'name':'alex','hobby':'喝酒'},
{'name':'alex','hobby':'烫头'},
{'name':'egon','hobby':'喊麦'},
{'name':'alex','hobby':'Massage'},
{'name':'egon','hobby':'街舞'},
]
list4 = []
for item in list3:
for dic in list4:
if item['name'] == dic['name']:
dic['hobby_list'].append(item['hobby'])
break
else:
list4.append({'name':item['name'],'hobby_list':[item['hobby']]})
print(list4)
结果[{'name': 'alex', 'hobby_list': ['抽烟', '喝酒', '烫头', 'Massage']}, {'name': 'egon', 'hobby_list': ['喊麦', '街舞']}]
##########################################################
递归实现列表剥皮
def f(x):
ret = []
for b in x:
if isinstance(b,list):
for a in f(b):
ret.append(a)
else:
ret.append(b)
return ret
