python 在 interactive mode 不允許直接在 if 結束時含有其他程式碼

綜合討論
#1 
>>> a = 5
>>> if a == 5:
...     print("a is 5")
... else:
...     print("a is not 5")
... print("if-else end")

猜看看在 python interactive mode 下這樣對不對？
答案是會跳出 SyntaxError: invalid syntax 錯誤

找了一下資料 read eval print loop - Why am I getting an invalid syntax error in Python REPL right after IF statement? - Stack Overflow
這裡有提到

The body of the loop is indented: indentation is Python’s way of grouping statements. At the interactive prompt, you have to type a tab or space(s) for each indented line. In practice you will prepare more complicated input for Python with a text editor; all decent text editors have an auto-indent facility. When a compound statement is entered interactively, it must be followed by a blank line to indicate completion (since the parser cannot guess when you have typed the last line). Note that each line within a basic block must be indented by the same amount.

有清楚指出在 interactive mode 一定要用空白行作為最後一個區塊的結束

但這只有限制在最後一個區塊，所以多用函數包住，就可以讓 print 直接在 if 結束之後使用，但函數結束後還是只能空白行結束；以及限制在interactive mode，所以在 jupyter notebook 或者寫成 python 檔案，上面的程式碼都不會出錯。