Using XLRD to read ExcelFilter 0 columns with a value greater than 99% and removeImport XlrdWorkbook=xlrd.open_workbook (R "123.xlsx")Table = Workbook.sheet_by_name (' Sheet1 ')Nrows=table.nrowsNcols=table.ncolsDel_col=[]For j in Range (Ncols):sum = 0For Ai in table.col_values (j):if ai = = 0.0:Sum+=1if float (sum)/nrows>=0.99:Del_col.append (j)print Del_col
Using Pandas to
About Python Getting started you should read this information to help you get started Python, with some reference value, interested in small partners can refer to
Online learning will always meet some good articles, share to everyone, but also thanks to the author's share.
About Python
Tags: content information ros col rip take digit field name cursor closeHttps://github.com/mkleehammer/pyodbc/wiki/Cursor using PYODBC to read a database, the process is basically the same as when you configure the Connect object, the following is the Excel: default is read-only, if you want to write a sentence, see the last. Import Pyodbc Step One: Create a Connect object str=r ' d:\work_studio\solarplate
"Python-ini" python read/write INI fileThe examples in this article describe how Python reads and writes INI files. Share to everyone for your reference. Specific as follows:For example, there is a file Update.ini, which contains these contents:
1 2 3 4 5 6 7 8
[ZIP]EngineVersion=0DATVersion=5127FileNa
a large amount of data, combined with scientific computing, machine learning and other technologies, data cleaning, deduplication, normalization and targeted analysis is the cornerstone of the big data industry. Python is one of the mainstream languages of data analysis.8. Artificial IntelligencePython in the field of artificial intelligence, machine learning, neural networks, deep learning and other aspects are the mainstream programming language, h
Explanation of file read/write and Related File object methods in Python Programming,
Python file read/write
The built-in functions for reading and writing files in python are open or file.
File_hander (file handle or object) = open (filename, mode)
Mode:
Description
R
Read, write, and PythonIn previous articles in the Explore Python series, you learned about basic Python data types and some container data types, such as tuple , string and list . Other articles discuss the conditions and looping characteristics of the Python language and how they collaborate with the container data t
1.1file read/write1.1.1Read the file>>> f = open ('/root/python/hello.py ', ' R ') # identifier r denotes read>>> f =open ('/root/python/hello1.py ', ' R ') # file does not exist errorTraceback (most recent):File "Filenotfounderror: [Errno 2] No such fileor directory: '/root/python
Stringio behaves very much like the file object, but it is not a document on disk, but a "file" in memory, and we can manipulate stringio as if it were a disk file. This article focuses on the Python Stringio module, which is primarily used to read and write data in a memory buffer. There is only one Stringio class in the module, so its available methods are in the class, and most of the functions in this c
Python read/write and file creation (required ),
Files and folders in python(File operation functions)The operation involves the OS module and shutil module.
Obtain the current working directory, that is, the directory path of the current Python script:OS. getcwd ()
Returns the names of all objects and directories in t
The operation of files, folders (file manipulation functions) in Python involves both the OS module and the Shutil module.
Get the current working directory, that is, the directory path of the current Python script work: OS.GETCWD ()
Returns all files and directory names under the specified directory name: Os.listdir ()
function to delete a file: Os.remove ()
Delete multiple directories: Os.removedirs (r
pointer to the beginning of the document5BUFF2 =fil5.read ()#The content is empty because the file is emptied6 Print 'w+ Mode First writes and then moves the pointer last read:'+buff2#What you read is what you just wrote.7Fil5.close ()Output:1 w+ mode first write and move the pointer last read: PPPPPPPPP
Deletion an
In the actual operation, we often read the file, this time Python provides us with an open () method for us to read the file, through Help (open), we can get open methodF.close () Turn off readF.read (Size=-1) reads a file size character, but does not assign a value to size or is assigned a negative number, reads all the remaining characters of the file and retur
The print keyword is used to output the following content to the screen.Str = "I love Python">>> Print strI love Python>>> Sum = lambda arg1, arg2: arg1 + arg2>>> Print '1 + 2 = % d' % sum (1, 2)1 + 2 = 3Input (), raw_input ()Both functions read strings from the command line. The former parses and returns the
the idea of inspiration.Three Common resource sites
Wowebook
If you are a love to chew the book programmer, this site will be your favorite, the website is a programming class of electronic books, resources are very rich, have a love to read a small partner, you can first come to this site to find.2.GithubOn GitHub, there's a lot of open source code repositories, and many programmers will upload their written projects to this place. Mic
How to read and write files in a Python Program
This article describes how to read and write files in a Python program. It is a basic knowledge of Python learning. For more information, see
Reading and Writing files is the most common IO operation.
1. Read the CSV file in Python :CSV is a comma delimiter format generally we use the EXECL generated format is XLS and xlsx directly renamed to CSV will be error:Error: Line contains NULL byteInsun Solution: The cause of the error is to rename the execl file with the suffix xls to csv as normal. If you save as a CSV file, you won't get an error.For example, we ha
modules with the same name is possible, another problem in the static language also has Ah, you link to a wrong library. At run time with )
As mentioned above, the static language can be compiled to help us detect, and do not have to wait until the runtime problems to know. While we have well-developed test cases, there are always cases where case is missing. So every time there was a run-time error, I thought about how good it would be if I could compile it. ( reviews: Do you have a co
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.