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