def total():
if os.path.exists(file_name): # 判断文件是否存在
with open(file_name, 'r') as rfile: # 打开文件
student_old = rfile.readlines() # 读取全部内容
amount=IterableHelper.get_count(student_old,lambda student:student)
print("一共有 %d 名学生！" % amount)
def get_count01():
count = 0
for phone in list_phones:
if phone.color == "白色":
count += 1
return count
def get_count02():
count = 0
for phone in list_phones:
if phone.price > 7000:
count += 1
return count
"""
print(IterableHelper.get_count(list_phones, lambda p: p.color == "白色"))
# [先用] -- 做通用函数时,调用 max_value.price 的函数
# [后做] -- 用通用函数时,做lambda代替 max_value.price 的函数
"""
def get_max01():
max_value = list_phones[0]
for i in range(1, len(list_phones)):
if max_value.price < list_phones[i].price:
max_value = list_phones[i]
return max_value
def get_max02():
max_value = list_phones[0]
for i in range(1, len(list_phones)):
if len(max_value.brand) < len(list_phones[i].brand):
def get_count(func):
count = 0
for item in list_wifes:
if func(item):
count += 1
return count
print(get_count(condition05))
# 调用静态方法
for itme in IterableHelper.find(list_wifes, condition01):
print(itme.__dict__)
print(IterableHelper.get_count(list_wifes, condition05))
# 使用lambda表达式
for itme in IterableHelper.find(list_wifes, lambda item:item.height > 170):
print(itme.__dict__)
print(IterableHelper.find_single(list_wifes,lambda item:item.name == "双儿").__dict__)
print(IterableHelper.get_count(list_wifes, lambda item:item.face_score > 90))
# 练习4：
# 需求1：在老婆列表中查找所有老婆的姓名与颜值
for item in IterableHelper.select(list_wifes,lambda wife:(wife.name,wife.face_score)):
print(item)
# 需求2：在老婆列表中查找所有老婆的身高、体重、颜值
for item in IterableHelper.select(list_wifes,lambda wife:(wife.height,wife.weight,wife.face_score)):
# def get_count(func):
# count = 0
# for item in list_wifes:
# if func(item):
# count += 1
# return count
#
# print(get_count(condition05))
# 调用静态方法
for itme in IterableHelper.find(list_wifes, lambda item: item.height > 70):
print(itme.__dict__)
# def condition01(item):
# return item.height > 170
print(IterableHelper.get_count(list_wifes, lambda item: item.height < 170))
# def condition05(item):
# return item.height < 170
for item in IterableHelper.find(list_wifes, lambda item: item.face_score < 90):
print(item.__dict__)
# def condition02(item):
# return item.face_score < 90
# 练习4：
# 需求1：在老婆列表中查找所有老婆的姓名与颜值
# 需求2：在老婆列表中查找所有老婆的身高、体重、颜值
for item in IterableHelper.select(list_wifes, lambda item:
(item.name, item.face_score)):
print(item)
def get_count02():
count = 0
for item in list_employees:
if len(item.name) == 2:
count += 1
return count
print(get_count01())
def condition01(item):
return item.did == 9001
def condition02(item):
return len(item.name) == 2
def get_count(condition):
count = 0
for item in list_employees:
# if len(item.name) == 2:
# if condition02(item):
# if condition01(item):
if condition(item):
count += 1
return count
print(get_count(condition02))
"""
print(IterableHelper.get_count(list_employees, lambda item: item.did == 9002))
value = get_count02()
print(value)
# 分 - 变化
# 火车
def condition01(item):
return item.money > 20000
# 汽车
def condition02(item):
return item.did == 9002
# 分 - 不变
def get_count(func):
count = 0
for item in list_employees:
# if item.did == 9002:
# if condition02(item):
# if condition01(item):
# 先确定用法
if func(item):
count += 1
return count
"""
value = IterableHelper.get_count(list_employees,
lambda item: item.money > 20000)
print(value)
IterableHelper.order_by(list_employees, lambda item: item.money)
print(list_employees)
if len(item.name) > 2:
count += 1
return count
"""
# 提取不变的
def get_count(list_target, func):
count = 0
for item in list_target:
# if item.price > 10000:
if func(item): # 使用参数(传入的函数 lambda)代替具体的逻辑判断
count += 1
return count
# 脑补
# def xxx(item):
# return item.price > 10000
# lambda 参数是列表的每个元素，函数体是对每个元素的判断逻辑.
result = get_count(list_commodity_infos, lambda commodity: commodity.price >= 10000)
print(result)
result = get_count(list_commodity_infos, lambda commodity: len(commodity.name) > 2)
print(result)
"""
result = IterableHelper.get_count(list_commodity_infos,
lambda commodity: commodity.price >= 10000)
print(result)
# for item in list_employees:
# if item.money > 20000:
# total_count += 1
# return total_count
#
#
# def get_count02():
# total_count = 0
# for item in list_employees:
# if item.did == 9001:
# total_count += 1
# return total_count
#
#
# def condition01(item):
# return item.money > 20000
#
# def coudition02(item):
# return item.did == 9001
#
# def get_count(func):
# total_count = 0
# for item in list_employees:
# if func(item):
# total_count += 1
# return total_count
print(IterableHelper.get_count(list_employees,
lambda item: item.money > 20000))
print(IterableHelper.get_count(list_employees, lambda item: item.did == 9001))