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Filter rows which contain a certain string
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# http://stat-computing.org/dataexpo/2009/the-data.html
df <- read_csv("Downloads/2008.csv")
print(dim(df))
# [1] 7009728 29
benchmark(
"str_detect" = {df %>% filter(str_detect(Dest, 'MCO|BWI'))},
"grepl" = {df %>% filter(grepl('MCO|BWI', Dest))},
replications = 10,
colum...
Why do I get a SyntaxError for a Unicode escape in my file path?
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f = open('C:\\Users\\Pooja\\Desktop\\trolldata.csv')
Use '\\' for python program in Python version 3 and above..
Error will be resolved..
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How to enter quotes in a Java string?
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This tiny java method will help you produce standard CSV text of a specific column.
public static String getStandardizedCsv(String columnText){
//contains line feed ?
boolean containsLineFeed = false;
if(columnText.contains("\n")){
containsLineFeed = true;...
What is polymorphism, what is it for, and how is it used?
... object (like an import file) and then determining what type it is (Excel, CSV, YAML, SQL, etc. etc.). To do this one would need some sort of factory class for Class_Excel, Class_CSV to be called, or have a Reader class called. Either way, some sort of iterative if/then/else is going to have to be...
Where are the PostgreSQL logs on macOS?
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hmm, in my case it's stderr :/ sql result as csv here: pastebin.com/20C92z2v
– basilikode
Apr 3 '10 at 10:47
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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...“舒适区”去探索新的技术，新的方法；把“非舒适区”转换成舒适区会拓展我们的知识面。这种不断探索的精神最后可能发展到——不仅仅停留在探索“IT技术”上，开始各种折腾，比如折腾电子制作、折腾写小说、折腾研究...
Format / Suppress Scientific Notation from Python Pandas Aggregation Results
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If you would like to use the values, say as part of csvfile csv.writer, the numbers can be formatted before creating a list:
df['label'].apply(lambda x: '%.17f' % x).values.tolist()
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Text Editor which shows \r\n? [closed]
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I really like the command od -c filename.csv. This one is working on the Terminal app. dr-palaniraja.blogspot.ca/2011/06/…
– M. Beausoleil
Dec 29 '16 at 17:16
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What are the differences among grep, awk & sed? [duplicate]
...le name lists.
Awk is an entire programming language built around reading CSV-style files, processing the records, and optionally printing out a result data set. It can do many things but it is not the easiest tool to use for simple tasks.
Sed is useful when you want to make changes to a file base...
Change the name of a key in dictionary
...dictionary comprehension:
This is an example I encountered while reading a CSV using a DictReader. The user had suffixed all the column names with ':'
ori_dict = {'key1:' : 1, 'key2:' : 2, 'key3:' : 3}
to get rid of the trailing ':' in the keys:
corrected_dict = { k.replace(':', ''): v for k, v i...