面試總結（二）

sum([i for i in range(0,100) if i % 2 ==1])

2.

list(set(lst))

or

def dedupe(items):

seen = set()

for item in items:

if item not in seen:

yield item

seen.add(item)

list(dedupe(lst))

3.

v = ‘abc’

r_v = v[::-1]

4.

def timeit(max_time):

def decorator(func):
    def wrapper(*args, **kwargs):
        
        t0 = time.time()
        result = func(*args, **kwargs)
        t1 = time.time()
        total = t1-t0
        print('"{f_n}" function ran for {total}'.format(f_n=func.__name__, total=total)
        if total > max_time:
            print('"{f_n}" function exceeds max_time'.format(f_n=func.__name__)
        return result
    return wrapper
return decorator
           

class InterInt(object):

def init(self):

self.a = 1

def __iter__(self):
    return self

def next(self):
    self.a += 1
    return self.a - 1
           

import collections

class CustomDict(collections.UserDict):

def __missing__(self, key):
    if isinstance(key, str):
        raise KeyError(key)
    return self[str(key)]

def __contains__(self, key):
    return str(key) in self.data

def __setitem__(self, key, item):
    self.data[str(key)] = item

def __getattr__(self, key):
    return self.data[str(key)]
           

if name == ‘main’:

cd = CustomDict(((‘a’, 1), (‘b’, 2)))

print(cd['a'])
print(cd['b'])