Python3 using CSV module to read and write CSV files

Python3 using CSV module to read and write CSV files

To read a CSV file:

Import CSV

#打开文件, with the open can not be deliberately closed file, Python3 does not support files () Open, only with open ()

With open ("Xxx.csv", "R", encoding= "Utf-8") as CSVFile:

     #读取csv文件, the iteration type is returned

     Read = Csv.reader (csvfile)

     For I in read:

          Print (i)

Save As CSV file:

Import CSV

With open ("Xxx.csv", "W", Newline= "") as Datacsv:

     #dialect为打开csv文件的方式, the default is excel,delimiter= "\ T" parameter refers to the delimiter at the time of writing

     Csvwriter = Csv.writer (Datacsv,dialect = ("Excel"))

     #csv文件插入一行数据, put each item in the following list into a cell (you can insert multiple rows in a loop)

     Csvwriter.writerow (["A", "B", "C", "D"])

Description:CSV module also has Dictreader and dictwriter can be used to read and write, return is the type of dictionary, but these two methods I have no use, interested can see for themselves.




Jieba participle

1 participle

• jieba.cutThe method accepts three input parameters: A string that requires a word breaker, a cut_all parameter to control whether a full mode is used, and a hmm parameter to control the use of HMM models.
• jieba.cut_for_searchThe method accepts two parameters: A string that requires a word breaker, or whether to use a HMM model. This method is suitable for the search engine to construct the inverted index word segmentation, the granularity is relatively fine
• The string to be participle can be a Unicode or UTF-8 string, GBK string. Note: It is not recommended to enter the GBK string directly, possibly incorrectly decoded into UTF-8
• jieba.cutAnd jieba.cut_for_search The returned structure is an iterative generator, you can use the For loop to get every word (Unicode) you get after a word breaker, or
• jieba.lcutand jieba.lcut_for_search return directly to list
• jieba.Tokenizer(dictionary=DEFAULT_DICT)Creates a new custom word breaker that can be used to use different dictionaries at the same time. jieba.dtas the default word breaker, all global word-breaker-related functions are the mappings for this word breaker.

# Encoding=utf-8import jiebaseg_list = Jieba.cut ("I came to Beijing Tsinghua University", cut_all=true) print ("Full Mode:" + "/". Join (seg_list)) 
   # Full Mode seg_list = Jieba.cut ("I came to Beijing Tsinghua University", Cut_all=false) print ("Default mode:" + "/". Join (Seg_list))  # precision Mode seg_list = Jieba.cut ("He came to NetEase Hang Research Building")  # Default is the Precision mode print (",". Join (seg_list)) Seg_list = Jieba.cut_for_search ("Xiao Ming graduated from the Chinese Academy of Sciences, After study at Kyoto University in Japan ")  # Search engine mode print (", ". Join (Seg_list))

Python3 using CSV module to read and write CSV files