如果字符串在Python的列表中，如何替换文本中的字符串？

dataframe有两列：句子和列表。要求将df['list']中存在的df['Session']中的字符串替换为找到的| present字符串

from pandas import DataFrame

df = {'list': [['Ford','Mercedes Benz'],['ford','hyundai','toyota'],['tesla'],[]],
        'sentence': ['Ford is less expensive than Mercedes Benz' ,'toyota and hyundai mileage is good compared to ford','tesla is an electric car','toyota too has electric cars']
        }

df = DataFrame(df,columns= ['list','sentence'])

df[‘句子’]的预期输出为：

Ford|present is less expensive than Mercedes Benz|present
toyota|present and hyundai|present mileage is good compared to ford|present
tesla|present is an electric car
toyota too has electric cars

---

使用正则表达式替换：

（从IPython互动会话中剪切）

---

可以使用apply函数和regex替换apply函数中的文本

重新导入
df={'list'：[['Ford'、'Mercedes-Benz']、['Ford'、'hyundai'、'toyota']、['tesla']、[]，
“句子”：[“福特比奔驰便宜”，“丰田和现代的里程比福特好”，“特斯拉是一辆电动车”，“丰田也有电动车”]
}
df=DataFrame（df，columns=['list'，'station']））
def replace_值（行）：
如果len（行列表）>0：
pat=r“（\b”+“|”。连接（行列表）+r”）（\b）”
打印（pat）
row.SENTURE=re.sub（pat，“\\1 | present\\2”，row.SENTURE）
返回行
df.应用（替换_值，轴=1）

您可以在数据框上使用自定义功能，如下所示：

代码

import pandas as pd

df = {'list': [['Ford','hyundai'],['ford','hyundai','toyota'],['tesla'],[]],
        'sentence': ['Ford is expensive than hyundai' ,'toyota and hyundai mileage is good compared to ford','tesla is an electric car','toyota too has electric cars']
        }

df = pd.DataFrame(df)

def rep_text(row):
    if not row.list:
        return row
    words = row.sentence.split()
    new_words = [word+'|present' \
    if word in row.list else word\
    for word in words]

    row['sentence'] = ' '.join(new_words)
    return row

df = df.apply(rep_text, axis=1)

输出

                      list                                           sentence
0          [Ford, hyundai]     Ford|present is expensive than hyundai|present
1  [ford, hyundai, toyota]  toyota|present and hyundai|present mileage is ...
2                  [tesla]                   tesla|present is an electric car
3                       []                       toyota too has electric cars

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为什么最后一项

丰田也有电动汽车

没有修改？因为相应的列表没有任何字符串可替换。这是一个空列表。你尝试过什么？你的方法有什么问题？最后一项（索引=3）被替换为“| presentt | presento | presento | presentt | presenta | presentt | presento | ansev/Dev”。谢谢。如果我们有福特汽车的话。这个词被替换为福特的礼物。精确的匹配会很好。不是吗？新法规并没有取代福特，但它确实取代了福特，成为了福特的“现在”。连字符S在present之后添加。我正在寻找一个精确的字符串匹配。

                      list                                           sentence
0          [Ford, hyundai]     Ford|present is expensive than hyundai|present
1  [ford, hyundai, toyota]  toyota|present and hyundai|present mileage is ...
2                  [tesla]                   tesla|present is an electric car
3                       []                       toyota too has electric cars