How can I remove the last character of a string in python?

This question already has an answer here: Is there a way to substring a string in Python? 10 answers As you say, you don't need to use a regex for this. You can use rstrip . my_file_path = my_file_path.rstrip('/') If there is more than one / at the end, this will remove all of them, eg '/file.jpg//' -> '/file.jpg' . From your question, I assume that would be ok.

我怎样才能删除python中的字符串的最后一个字符?

这个问题在这里已经有了答案: 有没有办法在Python中对字符串进行子串处理? 10个答案 正如你所说,你不需要为此使用正则表达式。 你可以使用rstrip 。 my_file_path = my_file_path.rstrip('/') 如果最后有多个/ ,则会将其全部删除,例如'/file.jpg//' - > '/file.jpg' 。 从你的问题来看,我认为这样可以。 最简单的是 正如@greggo指出的那样 string="mystring"; string[:-1] 你可以使用Stri

Strip all but first 5 characters

Possible Duplicate: Is there a way to substring a string in Python? I have a string in the form 'AAAH8192375948'. How do I keep the first 5 characters of this string, and strip all the rest? Is it in the form l.strip with a negative integer? Thanks. A string in Python is a sequence type, like a list or a tuple. Simply grab the first 5 characters: some_var = 'AAAH8192375948'[:5

除前5个字符外的所有字符

可能重复: 有没有办法在Python中对字符串进行子串处理? 我有一个形式为'AAAH8192375948'的字符串。 我如何保留这个字符串的前5个字符,并将所有剩下的字符去掉? 它是否为带有负整数的l.strip形式? 谢谢。 Python中的字符串是一个序列类型,就像一个列表或一个元组。 只需抓住前5个字符: some_var = 'AAAH8192375948'[:5] print some_var # AAAH8 切片符号为[start:end:increment] - 如果您想使用默认

Get the last 4 characters of a string

This question already has an answer here: Is there a way to substring a string in Python? 10 answers Like this: >>>mystr = "abcdefghijkl" >>>mystr[-4:] 'ijkl' This slices the string's last 4 characters. The -4 starts the range from the string's end. A modified expression with [:-4] removes the same 4 characters from the end of the string: >>>mystr[:-4]

获取字符串的最后4个字符

这个问题在这里已经有了答案: 有没有办法在Python中对字符串进行子串处理? 10个答案 喜欢这个: >>>mystr = "abcdefghijkl" >>>mystr[-4:] 'ijkl' 这将切分字符串的最后4个字符。 -4从字符串的结尾开始范围。 用[:-4]修饰的表达式将从字符串的末尾删除相同的4个字符: >>>mystr[:-4] 'abcdefgh' 有关切片的更多信息,请参阅此堆栈溢出答案。 str = "aaaaabbbb" newstr = str[-4:] 请参

How do you make a dictionary key from a CSV?

I'm having issues creating a dictionary key using a csvreader. I want to create a dictionary, which contains the location column where the data was found, so that I can write it out to a new location later. I haven't included the write function, because I want to understand how to do the create the keys first. For example, this data point 123-123-1234 was found in row[0]. input_file_

你如何从CSV中创建字典密钥?

我在使用csvreader创建字典密钥时遇到了问题。 我想创建一个字典,其中包含找到数据的位置列,以便稍后将它写出到新的位置。 我没有包含写函数,因为我想了解如何首先创建密钥。 例如,该数据点123-123-1234在行[0]中找到。 input_file_column_modification = '' myData = [] primary_key_list = {} if os.path.isfile(filename): input_file_column_modification = open(filename) myData = [item for item in csv.rea

How to efficiently check neighbor elements for characteristic

I have a text here for example Lorem ipsum lets say I am looking for car with a diesel engine. Realtext is about 11000 words. I am using Python3 and looked into nltk, but didnt find the right idea. Exampletext: Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et

如何有效地检查相邻元素的特征

我在这里有一个文本,例如Lorem ipsum可以说我正在寻找带柴油发动机的汽车。 实词约为11000字。 我正在使用Python3并查看nltk,但没有找到正确的想法。 Exampletext: Lorem ipsum dolor sit amet,consetetur sadipscing elitr,sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat,sed diam voluptua。 在vero eos et accusam et justo duo dolores et ea rebum。 Stet clita kasd gube

Text extraction from email in Python

My users will send me posts by email ala Posterous I'm using Google Apps Engine (GAE) to receive and parse emails. GAE returns the text part of the message. I need to extract the post from the plain text part of the message. The plain text can be "contaminated" with promotional headers, footers, signatures, etc. Also I would like to leave out the "please post this:&quo

从Python中的电子邮件中提取文本

我的用户将通过电子邮件ala Posterous向我发送帖子 我正在使用Google Apps Engine(GAE)来接收和解析电子邮件。 GAE返回消息的文本部分。 我需要从邮件的纯文本部分提取帖子。 纯文本可能会被宣传页眉,页脚,签名等“污染”。 另外我想省略“请贴这个:”或类似的一些人坦率地包含。 你会如何实现这一目标? 有什么工具(比正则表达式更简单)我可以使用吗? UPDATE 例子: (在所有这些例子中,这个帖子是“Lor

how to save csv into a txt, and search for records

Hello i'm new to python. I need to open a .csv archive(a list of ER admissions) read it and then save it into a .txt file. After that, I need to search for any record that includes any "death" and print it. I know how to open the csv and read it, but no clue how to save it into a txt. And the second part is giving me some trouble archivo = open('path/.csv', 'r+') for linea in a

如何将csv保存到txt中,并搜索记录

你好,我是新来的蟒蛇。 我需要打开一个.csv档案(ER录取的列表),然后将其保存到.txt文件中。 之后,我需要搜索任何包含任何“死亡”的记录并打印出来。 我知道如何打开csv并阅读它,但不知道如何将它保存到txt中。 第二部分给了我一些麻烦 archivo = open('path/.csv', 'r+') for linea in archivo.readlines(): archivo.write(linea.replace(',', ' ')) #I should be saving into a .txt here, open the txt and

Printing a random csv cell with string and inserted variable in Python 2

I am a python noob, so please take it easy on me. I have an example csv file (actual csv file has 20 rows and 2 columns similar to what is shown below): "I hate %s" % x, "I am a %s" % x "I heart %s" % x, "I am not a %s" % x My python 2.7 script: from csv import * x = "gorillas" with open('csv_test.csv', 'rU') as csvfile: spamreader = reader(csvfile, quoting = QUOTE_MINIMAL) list =

在Python 2中打印带有字符串和插入变量的随机csv单元格

我是一个python noob,所以请对我轻松一下。 我有一个示例csv文件(实际的csv文件有20行和2列类似于下面显示的内容): "I hate %s" % x, "I am a %s" % x "I heart %s" % x, "I am not a %s" % x 我的Python 2.7脚本: from csv import * x = "gorillas" with open('csv_test.csv', 'rU') as csvfile: spamreader = reader(csvfile, quoting = QUOTE_MINIMAL) list = [] for row in spamreader: list

"big" Data csv search from 2 files

I have an computational problem. I'm using python to iterate over 2 csv files. csv file1= contains (6-7) columns .. and the important column is an "rs ID" column from dbSNP. csv file2= 3 columns, 2 of them are important, also the rs ID and a GENE symbol column my problem: now i want to search: is an rs ID from csv file 1 IN csv 2 ? if yes, take the gene symbol from csv fi

“大”数据csv从2个文件中搜索

我有一个计算问题。 我正在使用python遍历2个csv文件。 csv file1 =包含(6-7)列......重要的列是来自dbSNP的“rs ID”列。 csv file2 = 3列,其中2个是重要的,也是rs ID和GENE符号列 我的问题: 现在我想搜索:是来自csv文件的rs ID 1 IN csv 2? 如果是,从csv文件2中取出基因符号,并将其放入发生匹配的csv文件1(位置“x”,例如行4512451)。 csv文件1 = 1,3 gb,csv文件2 = 8.8 mb 我从csv文件2生成python字

single entry of csv file using python

Been searching hi and low for an answer to what seems to be a really simple question, but can't find it and was hoping someone can help. I'm trying to use python to compare a field within a row of a csv file against a master list of codes and add to a tally of times it appears. like using the countif() and vlookup() functions in excel. The idea is that when the relevant file arrives

使用python单个输入csv文件

一直在寻找答案,似乎是一个非常简单的问题,但无法找到它,并希望有人可以提供帮助。 我试图使用python比较csv文件的一行中的字段与主代码列表,并将其添加到它显示的时间的记录中。 比如在excel中使用countif()和vlookup()函数。 这个想法是,当相关文件到达我的目录时,我可以运行这个脚本,而不必打开excel并手动完成工作。 麻烦的是,我似乎无法“自行”提取字段以使用if语句等。 下面的代码突出了我一直在尝试