eval

Python: apply math order of operations to reorder strings following hierarchy in parentheses

Python: apply math order of operations to reorder strings following hierarchy in parentheses Question: How can be done with Python to reorder a string applying the math operations order with parenthesys? Let me use an example: "son(father(granpa)mother))" ===> "granpa father mother son" The idea is to reorder the original string using the standar math order …

Total answers: 3

Why do I get None in output in second line while using eval function?

Why do I get None in output in second line while using eval function? Question: I am executing this line of code – print(eval("print(2 +3)")) but this instead of giving output as 5 gives output- 5 None Asked By: TusharGaurav || Source Answers: When you try to get eval of something like eval("2") you are …

Total answers: 3

Calling round(), ceiling(), floor(), min(), max() in pandas eval

Calling round(), ceiling(), floor(), min(), max() in pandas eval Question: As title says, Is there a way to support round, ceiling, min, max, floor functions in pandas eval. DataFrame: import pandas as pd import numexpr as ne op_d = {‘ID’: [1, 2,3],’V’:[‘F’,’G’,’H’],’AAA’:[0,1,1],’E’:[102014,112019,122017] ,’D’:[‘2019/02/04′,’2019/02/01′,’2019/01/01′],’DD’:[‘2019-12-01′,’2016-05-31′,’2015-02-15′],’CurrentRate’:[7.5,2,2],’NoteRate’:[2,3,3],’BBB’:[0,00,4],’Q1′:[2,8,00],’Q2′:[3,5,7],’Q3′:[5,6,8]} df = pd.DataFrame(data=op_d) abs() and sqrt() function works with pandas eval. i.e. …

Total answers: 3

Dynamically evaluate an expression from a formula in Pandas

Dynamically evaluate an expression from a formula in Pandas Question: I would like to perform arithmetic on one or more dataframes columns using pd.eval. Specifically, I would like to port the following code that evaluates a formula: x = 5 df2[‘D’] = df1[‘A’] + (df1[‘B’] * x) …to code using pd.eval. The reason for using …

Total answers: 2

Fetching and evaluating a Python code from an HTTP response in Python 3.X

Fetching and evaluating a Python code from an HTTP response in Python 3.X Question: I’m writing a Python script that gets an HTTP request as its input (namely, a url and some GET parameters). The response to the HTTP request is a piece of Python code representing a big Python dictionary. My script should evaluate …

Total answers: 2

Evaluate math equations from unsafe user input in Python

Evaluate math equations from unsafe user input in Python Question: I have a website where the user enters math equations (expressions) and then those equations are evaluated against data (constants) provided by the website. The math operations needed include symbols, arithmetic operations, min(), max() and some other basic functions. A sample equation could be: max(a …

Total answers: 2

eval to import a module

eval to import a module Question: I can’t import a module using the eval() function. So, I have a function where if I do import vfs_tests as v it works. However, the same import using eval() like eval(‘import vfs_tests as v’) throws a syntax error. Why is this so? Asked By: Siddharth || Source Answers: …

Total answers: 4

Using python's eval() vs. ast.literal_eval()

Using python's eval() vs. ast.literal_eval() Question: I have a situation with some code where eval() came up as a possible solution. Now I have never had to use eval() before but, I have come across plenty of information about the potential danger it can cause. That said, I’m very wary about using it. My situation …

Total answers: 7

What does Python's eval() do?

What does Python's eval() do? Question: In the book that I am reading on Python, it keeps using the code eval(input(‘blah’)) I read the documentation, and I understand it, but I still do not see how it changes the input() function. What does it do? Can someone explain? Asked By: Billjk || Source Answers: The …

Total answers: 12