python的部分内置函数

fn = lambda a, b : a + b # 定义一个很简单的函数. 复杂的函数不要用lambda
ret = fn(3, 5)
print(ret)
print(fn)

lst = [11,5,36,1,27,58]
s = sorted(lst) # 默认从小到大排序.
print(s)
lst1 = ["胡一菲", "张伟", "关谷神奇", "曾小贤吕小布", "诺澜"]
def func(s):
    return len(s) # 返回长度
s = sorted(lst, key=func)
print(s)
#使用匿名函数配合sorted使用
#print(sorted(lst, key=lambda s:len(s) ))

lst = ["张无忌", "张翠山", "范冰冰", "金毛狮王", "李冰冰"]
# 过滤掉姓张的人
f = filter(lambda name : not name.startswith("张"), lst)
print("__iter__" in dir(f)) # 可迭代对象
for el in f:
    print(el)

lst = [
    {"name":"alex", "shengao":150, "tizhong":250},
    {"name":"wusir", "shengao":158, "tizhong":150},
    {"name":"taibai", "shengao":177, "tizhong":130},
    {"name":"ritian", "shengao":165, "tizhong":130},
    {"name":"nvshen", "shengao":160, "tizhong":120},
    {"name":"baolang", "shengao":183, "tizhong":190}
]
# 过滤掉体重大于180的人   想要的是 小于180
f = filter(lambda d : d['tizhong'] <= 180, lst)
print(list(f))

lst = ["篮球球", "打打台球", "唱歌", "爬慌山", "步"]
m = map(lambda s: "爱好:"+s , lst)
print(list(m))
lst = [1,5,78,12,16] # 计算每个数字的平方
print([i **2 for i in lst])
m = map(lambda i: i ** 2, lst)
print(list(m))

s = "18+2"
ret = eval(s) # 执行字符串类型的代码
print(ret)
s = "{'name':'alex', 'age':18, 'isMan':False}" # 字符串
ret = eval(s)  # 侧重的有返回值
print(ret)
print(type(ret))

code = input("请输入你要执行的代码")
exec(code) # 没有返回值. 想要返回值用eval
print(a)   # pycharm报错不一定准

code = '''
for i in range(10):
    if i % 2 == 0:
        print(i)
'''
c = compile(code, "", "exec") # 预加载代码
exec(c) # 运行代码