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When the Python source code is compiled into bytecode.

• nomel 6y ago
  That byte code is then interpreted at runtime, so the meaning of s.upper() could change. What something does, when it’s parsed, is not fixed. You can definitely catch most cases at runtime. I’ve done something like this, in an library, to catch a case where people were treating the copy of data as a mutable view. interface[address][slice] = new_values # fancy noop Where a read, modify, write was required: byte_values = interface[address] byte_values[slice] = new_values interface[address] = byte_values It would log/raise a useful error if the there was no assignment/passing of the return value.