Why does typing a variable (or expression) print the value to stdout?

Why does typing a variable (or expression) print the value to stdout?

Take this example:

Take this example:

>>> 5+10
15
>>> a = 5 + 10
>>> a
15

How and why does Python do this without an explicit print statement?

If I do the same thing in an IPython cell, only the last such value is actually printed on stdout in this way:

In[1]: 5+10
       1

Out[1]: 1

Why does this happen?

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