Created
October 11, 2018 04:50
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反序列化数据列,支持字符,数组,字典等复杂结构,
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""" | |
导出数据 | |
~~~~~~~~~~~~~ | |
反序列化数据列,支持字符,数组,字典等复杂结构, | |
TODO: | |
- 数据类型标注: string,bool,int,float | |
- 默认值 | |
- 必须值 | |
""" | |
def read_char(s, pos): | |
r = "" | |
while pos < len(s) and s[pos].isalpha(): | |
r += s[pos] | |
pos += 1 | |
return r, pos | |
def read_next(s, pos): | |
if pos < len(s): | |
return s[pos + 1] | |
return None | |
def read_until(s, pos, t): | |
""" | |
:param s: | |
:param pos: | |
:param t: terminate char | |
:return: | |
""" | |
r = "" | |
while pos < len(s) and s[pos] != t: | |
r += s[pos] | |
pos += 1 | |
return r, pos | |
def parse(s, value, data, pos=0): | |
token, pos = read_char(s, pos) | |
if pos == len(s): | |
data[token] = value | |
return data | |
c = s[pos] # current pointer | |
if c == '.': | |
data[token] = parse(s, value, data={}, pos=pos + 1) | |
return data | |
elif c == '[': | |
data.setdefault(token, []) | |
num, pos = read_until(s, pos=pos + 1, t="]") | |
if num: | |
length = int(num) + 1 | |
data[token] += [None for _ in range(length - len(data[token]))] | |
c = read_next(s, pos) | |
if c is None: | |
data[token][int(num)] = value | |
elif c == '.': | |
x = data[token][int(num)] or {} | |
data[token][int(num)] = parse(s, value, data=x, pos=pos + 2) | |
return data | |
else: | |
data[token] = value.split(';') | |
return data | |
return data | |
assert parse('name', 'yxy', data={}) == {'name': 'yxy'} | |
assert parse('name.first', 'yxy', data={}) == {'name': {'first': 'yxy'}} | |
assert parse('name[]', 'yxy;xx;xx', data={}) == {'name': ['yxy', 'xx', 'xx']} | |
assert parse('name[1].first', 'yxy', data={}) == {'name': [None, {'first': 'yxy'}]} | |
assert parse('name[0].name', 'yxy', data={}) == {'name': [{'name': 'yxy'}]} | |
assert parse('name[1].first', 'yxy', data={}) == {'name': [None, {'first': 'yxy'}]} | |
assert parse('name[1].first[]', '1;2;3', data={}) == {'name': [None, {'first': ['1', '2', '3']}]} | |
def main(): | |
from pprint import pprint | |
from csv import DictReader | |
with open('data.csv') as fb: | |
reader = DictReader(fb) | |
dataset = [] | |
for kv in reader: | |
data = {} | |
for k, v in kv.items(): | |
parse(k, v, data=data, pos=0) | |
dataset.append(data) | |
pprint(dataset) | |
if __name__ == "__main__": | |
main() |
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