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Use a+=[b] instead of a.append(b) The title says it all. a=[];b=10;print(a) a+=[b];print(a) Try it online!
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# Use `a+=[b]` instead of `a.append(b)` The title says it all. <!-- language-all: lang-python --> a=[];b=10;print(a) a+=[b];print(a) [Try it online!][TIO-ktgijmli] [Python 3]: https://docs.python.org/3/ [TIO-ktgijmli]: https://tio.run/##K6gsycjPM/7/P9E2OtY6ydbQwLqgKDOvRCNRkytR2zY6KRbO//8fAA "Python 3 – Try It Online"