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[英]How to handle special characters in comments and hard coded strings in python file?
[英]Python Pandas handle special characters in strings
我寫了一個 function,稍后我想申請一個 dataframe。
def get_word_count(text,df):
#text is a lowercase list of words
#df is a dataframe with 2 columns: word and count
#this function updates the word counts
#f=open('stopwords.txt','r')
#stopwords=f.read()
stopwords='in the and an - '
for word in text:
if word not in stopwords:
if df['word'].str.contains(word).any():
df.loc[df['word']==word, 'count']=df['count']+1
else:
df.loc[0]=[word,1]
df.index=df.index+1
return df
然后我檢查一下:
word_df=pd.DataFrame(columns=['word','count'])
sentence1='[first] - missing "" in the text [first] word'.split()
y=get_word_count(sentence1, word_df)
sentence2="error: wrong word in the [second] text".split()
y=get_word_count(sentence2, word_df)
y
我得到以下結果:
Word Count [first] 2 missing 1 "" 1 text 2 word 2 error: 1 wrong 1
那么sentence2中的[second]在哪里?
如果我省略其中一個方括號,我會收到一條錯誤消息。 如何處理帶有特殊字符的單詞? 請注意,我不想擺脫它們,因為如果我這樣做,我會錯過sentence1中的"" 。
問題來自以下行:
if df['word'].str.contains(word).any():
這會報告word
列中的任何單詞是否包含給定的單詞。 來自df['word'].str.contains(word)
在給出[second]
並與特定[first]
進行比較時報告True
。
為了快速修復,我將行更改為:
if word in df['word'].tolist():
不建議在這樣的循環中創建 DataFrame,您應該這樣做:
stopwords='in the and an - '
sentence = sentence1+sentence2
df = pd.DataFrame([sentence.split()]).T
df.rename(columns={0: 'Words'}, inplace=True)
df = df.groupby(by=['Words'])['Words'].size().reset_index(name='counts')
df = df[~df['Words'].isin(stopwords.split())]
print(df)
Words counts
0 "" 1
2 [first] 2
3 [second] 1
4 error: 1
6 missing 1
7 text 2
9 word 2
10 wrong 1
我以一種你可以添加句子並看到頻率增長的方式重建它
from collections import Counter
from collections import defaultdict
import pandas as pd
def terms_frequency(corpus, stop_words=None):
'''
Takes in texts and returns a pandas DataFrame of words frequency
'''
corpus_ = corpus.split()
# remove stop wors
terms = [word for word in corpus_ if word not in stop_words]
terms_freq = pd.DataFrame.from_dict(Counter(terms), orient='index').reset_index()
terms_freq = terms_freq.rename(columns={'index':'word', 0:'count'}).sort_values('count',ascending=False)
terms_freq.reset_index(inplace=True)
terms_freq.drop('index',axis=1,inplace=True)
return terms_freq
def get_sentence(sentence, storage, stop_words=None):
storage['sentences'].append(sentence)
corpus = ' '.join(s for s in storage['sentences'])
return terms_frequency(corpus,stop_words)
# tests
STOP_WORDS = 'in the and an - '
storage = defaultdict(list)
S1 = '[first] - missing "" in the text [first] word'
print(get_sentence(S1,storage,STOP_WORDS))
print('\nNext S2')
S2 = 'error: wrong word in the [second] text'
print(get_sentence(S2,storage,STOP_WORDS))
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