from ast import literal_eval def get_type(input_data): try: return type(literal_eval(input_data)) except (ValueError, SyntaxError): # A string, so return str return str print(get_type(“1”)) # <class ‘int’> print(get_type(“1.2354”)) # <class ‘float’> print(get_type(“True”)) # <class ‘bool’> print(get_type(“abcd”)) # <class ‘str’>
Use a global regular expression to replace all commas with an empty string: var str = “12,345,678”; str = str.replace(/,/g, “”); parseInt(str, 10);
Unfortunately, almost no one of the participants ever clearly understands what are they talking about. Literally. Only Kibbee managed to make it straight. This topic is all about sanitization. But the truth is, such a thing like wide-termed “general purpose sanitization” everyone is so eager to talk about is just doesn’t exist. There are a … Read more
You can use non-blocking read from stdin: import sys import os import fcntl import time fl = fcntl.fcntl(sys.stdin.fileno(), fcntl.F_GETFL) fcntl.fcntl(sys.stdin.fileno(), fcntl.F_SETFL, fl | os.O_NONBLOCK) while True: print(“Waiting for user input”) try: stdin = sys.stdin.read() if “\n” in stdin or “\r” in stdin: break except IOError: pass time.sleep(1)
All three situations you’ve described are where you need to specifically go out of your way to ensure you are using loose coupling in your design. Do you really need to unit test Python’s raw_input method? The open method? os.environ.get? No. You need to set up your design so that you can substitute other ways … Read more
EAFP try: x = float(a) except ValueError: print(“You must enter a number”)
Breakdown of scanf(“%*[^\n]%*c”): %*[^\n] scans everything until a \n, but doesn’t scan in the \n. The asterisk(*) tells it to discard whatever was scanned. %*c scans a single character, which will be the \n left over by %*[^\n] in this case. The asterisk instructs scanf to discard the scanned character. Both %[ and %c are … Read more
Mocking os.Stdin You’re on the right track that os.Stdin is a variable (of type *os.File) which you can modify, you can assign a new value to it in tests. Simplest is to create a temporary file with the content you want to simulate as the input on os.Stdin. To create a temp file, use ioutil.TempFile(). … Read more
Here is a version with all optional type annotations and error handling which may be useful for beginners like me: use std::io; fn main() { let mut input_text = String::new(); io::stdin() .read_line(&mut input_text) .expect(“failed to read from stdin”); let trimmed = input_text.trim(); match trimmed.parse::<u32>() { Ok(i) => println!(“your integer input: {}”, i), Err(..) => println!(“this … Read more
Generally, fgets() is considered a good option. It reads whole lines into a buffer, and from there you can do what you need. If you want behavior like scanf(), you can pass the strings you read along to sscanf(). The main advantage of this, is that if the string fails to convert, it’s easy to … Read more