Python小技之小技小集合一

d = {'a':[{},{},{}], "b":[{}], "c":[{},{},{}], 'd':[{},{}]}

倒序:
dd = dict(sorted(d.items(), key=lambda item:len(item[-1])))
正序
dd = dict(reversed(sorted(d.items(), key=lambda item:len(item[-1]))))

a = {"a": 1, "b": 0, "c": 2}
b = {"a": 0, "b": 2}
c = {k: v + b.get(k,0)  for k,v in a.items()}

1. a_dict.update(b_dict)
2. c_dict = {**a_dict, **b_dict}

key_exists = True if key in a_dict else False

kv_dict = dict(zip(key_list, value_list))

num = re.sub(r"[^\d]", "", value) or 0

1. a_list += b_list
2. a_list.extend(b_list)

a = d_dict.get("a") or "a"

a, b = b, a

a, b, c = (a, b, c)

a_list[::-1]

exists_b_list = [value for value in b if value not in a]

In [29]: all(("a", 0))
Out[29]: False

In [31]: any(("a", 1))
Out[31]: True

def get_row_num(file_pname):
    for count, line in enumerate(open(file_pname, 'r'), start=1):
        pass
    return count

1. [line for line in open("test.py")]
2. open("test.py").readlines()

import hashlib
def genearte_hash(value):
    if not isinstance(value, str):
        value = str(value)
    hl = hashlib.md5()
    hl.update(value.encode(encoding='utf-8'))
    return hl.hexdigest()

logging.getLogger("requests").setLevel(logging.WARNING)