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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I can calculate the rank of the values val in my dataframe df within the group name1 with the code:.
However, the code below does not work since crit1 is assumed to be the column name instead of a variable name. Or another option is to convert to symbols syms from rlang and evaluate!!!
Learn more. Asked 3 years, 9 months ago. Active 10 months ago. Viewed 4k times. Thanks, Tom. TomDriftwood TomDriftwood 2 2 silver badges 7 7 bronze badges. Active Oldest Votes. Helen Thanks for notifying. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing. Podcast Programming tutorials can be a real drag.
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Explore how to write functions, including using functions to calculate formulas, getting string and numeric input, and writing formatted output. Programming is like writing a script, creating a predetermined list of words and actions for actors to perform night after night. A Python function is not so different. In this chapter, I explore how to write functions, including the following:. For people accustomed to the Fahrenheit scale, 25 is cold enough to freeze your proverbial hockey stick.
So I have to mentally run a conversion. If you have the Python interactive environment running, this is an easy calculation.
I can convert 20 degrees in my head, but what about 25? The following statements assign a value to the name cels a variableuse that value to assign another value to the name fahrand then finally display what the fahr value is. Python prints the answer with a decimal point: What is the Fahrenheit value of 32 degrees Celsius? Thirty-two degrees on the Celsius scale is And—here is the critical part—if this function worked generally, as if it were part of Python, I could use it to convert any number from Celsius to Fahrenheit.
But Python lets me create my own such function. This is what the def keyword does: define a new function. We could write it this way from within the interactive environment:. Actually, they do quite a bit.Python tutorial 13: Python String - replace ( ) method by Manish Sharma
They associate the symbolic name convert with something referred to as a callable in Python, that is, a function. This message tells you that convert has been successfully associated with a function. There were no syntax errors; however, runtime errors are always possible.
Writing Functions in Python
Not until we execute convert do we know whether it runs without errors. But this is easy. To execute a function, just follow it with parentheses—enclosing any argumentsif any. If instead you get a syntax error, remember that you can easily edit a function by 1 moving the cursor to any line of the function and 2 pressing Enter. The entire function definition will reappear, and you can edit it by moving the cursor up and down. Finally, you can reenter it again.
To reenter, put your cursor on the end of the last line and press Enter twice. The definition of convert is followed by parentheses and the name of an argument.Java String has three types of Replace method replace replaceAll replaceFirst.
With the help of these you can replace characters in your string. Lets study each in details: Java String replace Method Java String replace method replaces every occurrence of a given character with a new character and returns a new string.
This method allows the replacement of a sequence of character values. Return Value This function returns a string by replacing oldCh with newCh. At the end of call, a new string is returned by the function. Matching of the string starts from the beginning of a string left to right. Return Value This method returns resulting String as an output. A design pattern is a language independent strategy for What is Jasper Reports?
JasperReports is an open-source Java reporting engine. This Java class What is String "Length" Method in Java? This function is used to get the length of a Java String Home Testing. Must Learn! Big Data. Live Projects. Java String replace Method Java String replace method replaces every occurrence of a given character with a new character and returns a new string. Java String Replaceall Java String replaceAll method finds all occurrences of sequence of characters matching a regular expression and replaces them with the replacement string.
Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I want to update my CSV file to now include name3, pass3since those aren't in the CSV file but they are in the dictionary. There's no better way than creating a temporary dictionary to quickly update the contents of the entire file the way you want.
However you can speed things by not using csv. DictReader and csv. DictWriter because they require building a separate temporary dictionary for each row processed.
Here's a more efficient version based on that supposition that also effectively updates the file "in-place". Note that the order of the rows in the file will be changed as a result of storing them temporarily in the dictionary. If that's important, use a collections.
OrderedDict instead. Also noteworthy is that it would be even more efficient to use user's suggestion, and instead do a less complicated mydict. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Updating a. Asked 4 years, 8 months ago. Active 8 months ago. Viewed 18k times. It has the following content: Username, Password name1, pass1 name2, pass I also have a dictionary, call it mydict.
What's the most efficient, pythonic way of doing this? DictWriter outfile, r. Any suggestions? You're reading one file and writing to another.
But I haven't decided what I'll do at that point yet. Faster, use less memory, or what? Active Oldest Votes. I like this a lot! However, could you explain the purpose of appending '. See What should I do when someone answers my question? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing.This article explains the new features in Python 2.
The final release of Python 2. The changes in Python 2. The language changes are of middling significance. Conditional expressions were finally added to the language using a novel syntax; see section PEP Conditional Expressions. As well as the language and library additions, other improvements and bugfixes were made throughout the source tree. A search through the SVN change logs finds there were patches applied and bugs fixed between Python 2. Both figures are likely to be underestimates. For full details, you should always refer to the documentation for Python 2.
If you want to understand the complete implementation and design rationale, refer to the PEP for a particular new feature. Comments, suggestions, and error reports for this document are welcome; please e-mail them to the author or open a bug in the Python bug tracker.
For a long time, people have been requesting a way to write conditional expressions, which are expressions that return value A or value B depending on whether a Boolean value is true or false. A conditional expression lets you write a single assignment statement that has the same effect as the following:.
There have been endless tedious discussions of syntax on both python-dev and comp. A vote was even held that found the majority of voters wanted conditional expressions in some form, but there was no syntax that was preferred by a clear majority.
Evaluation is still lazy as in existing Boolean expressions, so the order of evaluation jumps around a bit. The decision was checked by applying the new syntax to the modules in the standard library and seeing how the resulting code read.
The conditional syntax makes this pattern a bit more obvious:. There was some discussion of whether the language should require surrounding conditional expressions with parentheses. Consider these two statements:.
Writing Functions in Python
The second version reads better, in my opinion, because it makes it clear that the assignment is always performed and the choice is being made between two values. Another reason for including the brackets: a few odd combinations of list comprehensions and lambdas could look like incorrect conditional expressions.
See PEP for some examples. The functools module is intended to contain tools for functional-style programming. One useful tool in this module is the partial function. Consider a Python function f a, b, c ; you could create a new function g b, c that was equivalent to f 1, b, c. The resulting object is callable, so you can just call it to invoke function with the filled-in arguments.
Here a context- sensitive pop-up menu is being constructed dynamically. For example, you might write:. An alternate version of the previous example would be:. Some simple dependency support was added to Distutils. The setup function now has requiresprovidesand obsoletes keyword parameters. The new upload Distutils command will upload a package to the repository.
Before a package can be uploaded, you must be able to build a distribution using the sdist Distutils command. Once that works, you can run python setup. Optionally you can GPG-sign the package by supplying the --sign and --identity options.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm new to Python and this challenge is difficult for me to figure out.
I have to: Pass in 2 strings, name1 and name2. You should output another string in the format. Learn more. How do I replace name1 and name2 with an input string in Python using escaping?
Ask Question. Asked 2 years, 5 months ago. Active 2 years, 5 months ago. Viewed 2k times. You should output another string in the format name1's done and name2's done with a new line between the two and where name1 and name2 are replaced with the input string.
Shekhar 9, 31 31 gold badges silver badges bronze badges. Mic T. Mic 9 2 2 silver badges 6 6 bronze badges. Active Oldest Votes. Use format to print this output:. With a few edits, this worked!
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. This is probably pretty simple, but I have a list with strings that also correspond to variable names:. Usually it's better to just have a list of the objects, or use a separate namespace as Haidro suggests. You can define a function, which does that switch, and pass the function and list into the in-built map function.
Learn more. Asked 6 years, 9 months ago. Active 6 years, 9 months ago. Viewed 3k times. Active Oldest Votes. You don't want to do this. TerryA TerryA Steve Barnes Steve Barnes Haidro In this case, where the OP would be eval ing hard coded variable names, is eval really that dangerous? Surely if eval will never accept user input it can't be more dangerous than the code itself, or am I missing something? SethMMorton If he defined the list himself, he could have done [name1, name2, etc] not strings.
Haidro Agreed You could also just put the objects in the list. Keith Keith Sign up or log in Sign up using Google. Sign up using Facebook.