I have a python function that must read data from file and split it into two key and value, and then store it in dictionary. Example: file: I use the split function for it, but when there is really a lot of data it raises value error What can I do about this ? This is the exact code that
Tag: string
How does the max() function work on list of strings in python?
I have a list: It gives: Please also explain how it perform comparison on list of strings and list of numbers. Answer This is actually a good question and the answer varies depending on whether you’re on python2.x or python3.x … And which python implementation you’re using1. See here for a d…
How to pad a string to a fixed length with spaces in Python?
I’m sure this is covered in plenty of places, but I don’t know the exact name of the action I’m trying to do so I can’t really look it up. I’ve been reading an official Python book for 30 minutes trying to find out how to do this. Problem: I need to put a string in a certain leng…
Check if a string contains a number
Most of the questions I’ve found are biased on the fact they’re looking for letters in their numbers, whereas I’m looking for numbers in what I’d like to be a numberless string. I need to enter a string and check to see if it contains any numbers and if it does reject it. The function …
How to check if a string is a valid regex in Python?
In Java, I could use the following function to check if a string is a valid regex (source): Is there a Python equivalent of the Pattern.compile() and PatternSyntaxException? If so, what is it? Answer Similar to Java. Use re.error exception: exception re.error Exception raised when a string passed to one of th…
How to split the integers and Operators characters from string in python?
I want to split the string into integers and operators for doing Infix expression evaluation in python. Here is my string: I tried this to split: This is wrong. Since ’10’ is splitted into ‘1’,’0′ I tried alternative: This is also went wrong. Since ‘)*’ should b…
Python string ‘in’ operator implementation algorithm and time complexity
I am thinking of how the in operator implement, for instance In CPython, which algorithm is used to implement the string match, and what is the time complexity? Is there any official document or wiki about this? Answer It’s a combination of Boyer-Moore and Horspool. You can view the C code here: Fast se…
format strings and named arguments in Python
Case 1: It will give KeyError: ‘arg1′ because I didn’t pass the named arguments. Case 2: Now it will work properly because I passed the named arguments. And it prints ’10 20’ Case 3: And, If I pass wrong name it will show KeyError: ‘arg1’ But, Case 4: If I pass the na…
Convert range(r) to list of strings of length 2 in python
I just want to change a list (that I make using range(r)) to a list of strings, but if the length of the string is 1, tack a 0 on the front. I know how to turn the list into strings using but I want to be able to also change the length of those strings. Input: Output: And if
Convert set to string and vice versa
Set to string. Obvious: String to set? Maybe like this? Extremely ugly. Is there better way to serialize/deserialize sets? Answer Use repr and eval: Note that eval is not safe if the source of string is unknown, prefer ast.literal_eval for safer conversion: help on repr: