在字典中查找两个字符之间的字符串

Question

你能找到字符之间的子串吗我想找到这个字符svm？我看了 and Find string between two substrings。所以这是我的字符串 ('svm', SVC()) 我想找到 ' ' 之间的所有内容所以结果应该是 svm 或 dct_test

import re 
dict_SupportVectorMachine = {
    "classifier": ('svm', SVC()),
    "parameters": {'svm__C':[0.001,0.01,0.1,10, 100],
                   'svm__gamma':[0.1,0.01],
                   'svm__kernel':['linear', 'sigmoid']}
}

string = dict_SupportVectorMachine['classifier']
string2 = ('dct_test', ThisCouldbeLongerAndShorter())
subStr = re.findall(r"('(.+?)',",string)
print(subStr)

[OUT]
error: missing ), unterminated subpattern at position 0

Answer 1

第四行好像漏了一个):

import re 
string = "('svm', SVC())"
string2 = "('dct_test', ThisCouldbeLongerAndShorter()))"
subStr = re.findall(r"('(.+?))',",string)
print(subStr)

Answer 2

您拥有的是一个包含 2 个元素的 tuple：一个 str 和一个 SVC 实例，只需获取第一个索引

dict_SupportVectorMachine = {
    "classifier": ('svm', SVC()),
    "parameters": {}
}

classif = dict_SupportVectorMachine['classifier']
print(classif[0])  # svm

由于问题不同，旧答案

括号是用于构建组的特殊字符，对于真正的括号你需要转义它\(。在此处也使用 search 而不是 findall

import re

string = "('svm', SVC())"
print(re.findall(r"\('(.+?)',", string))  # ['svm']
print(re.search(r"\('(.+?)',", string).group(1))  # svm

string2 = "('dct_test', ThisCouldbeLongerAndShorter()))"
print(re.findall(r"\('(.+?)',", string2))  # ['dct_test']
print(re.search(r"\('(.+?)',", string2).group(1))  # dct_test

在字典中查找两个字符之间的字符串

Find string between two characters inside of dict

python

string

dictionary

python-re

由于问题不同，旧答案