f string concatenation problem - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: Python Coding (https://python-forum.io/forum-7.html) +--- Forum: General Coding Help (https://python-forum.io/forum-8.html) +--- Thread: f string concatenation problem (/thread-34117.html) |
f string concatenation problem - growSeb - Jun-28-2021 Hi Group, I'm new. So hopefully I'll figure out how to navigate this forum and get the help I need as I'm trying to learn python. Currently, I'm having a problem with what I believe is called f-string concatenation. I'm using pycharm to code python as I'm working my way through a book called Neural Networks from Scratch. The code I've typed out is long.... but the snippet I'm having a problem with is this: print(f'epoch:{epoch}, ' + f"acc: {accuracy: .3f}, ' + f'loss: {loss: .3f}, ' + f'lr: {optimizer.current_learning_rate}')The error is: I think that pycharm perhaps doesn't like the way it's set up. I don't know. Can someone explain what's gone wrong or how I can fix it?TIA. RE: f string concatenation problem - bowlofred - Jun-28-2021 It's telling you that instead of being a number as you suppose, one of your variables (probably loss ) is None. Trying to apply a numeric format to None generates an error.
RE: f string concatenation problem - growSeb - Jun-28-2021 Actually, I think I understand now. It wasn't apparent at first. Thanks. RE: f string concatenation problem - buran - Jun-28-2021 Actually your code shows that you don't understand f-strings. There is no need of concatenation. print(f'epoch:{epoch}, acc: {accuracy: .3f}, loss: {loss: .3f}, lr: {optimizer.current_learning_rate}')This is assuming you fix the problem with loss being None .
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