用正则表达式查找关键词后的数字

def getOUTCAR(self):
    # import re
    parameter = {}
    f = open(self.path + "/OUTCAR", 'r')
    lines = f.readlines()
    for line in lines:
        if "E-fermi" in line:
            Efermi = re.compile(
                r"(?<=E-fermi :   )\d+\.?\d*").findall(line)
            Efermi = list(map(float, Efermi))
            parameter['E-fermi'] = Efermi[0]  # print(line)
    f.close()

    return parameter

def DOS(self):
    # 打开DOSCAR文件
    f = open(self.path + "/DOSCAR", 'r')
    lines = f.readlines()