Python is going to be hard

Rustom Mody rustompmody at
Thu Sep 4 05:22:47 CEST 2014

On Thursday, September 4, 2014 7:26:56 AM UTC+5:30, Chris Angelico wrote:
> On Thu, Sep 4, 2014 at 11:48 AM, Rustom Mody  wrote:
> >>>> NO PRINT

> Yes, or the OP could work with actual saved .py files and the
> reliability that comes from predictable execution environments... and
> use print. Why are you so dead against print?

Here is the most recent (2013) ACM/IEEE CS curriculum:

It is divided into tiers with core-tier1 being the bare minimum that
all CS graduate need to know.

One of (the many!) things there is this (pg 158)

| Functional Programming (3 Core-Tier1 hours)

| Effect-free programming
| -- Function calls have no side effects, facilitating compositional reasoning
| -- Variables are immutable, preventing unexpected changes to program data by other code
| -- Data can be freely aliased or copied without introducing unintended effects from mutation

So to answer your question: print statements are side-effecting and therefore obstruct
compositional reasoning.

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