Type discipline：
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habit of A: checking out operators or procedures to see what they do under different circumstances, either check them out or read the specifications of it.
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habit of B: when you write your own code, you want to be disciplined about what types of arguments or operands you apply to operators.
assignment statement:
x = 3*5andy = 15binding same value. Letz = xgive z a pointer to the same place. To the value, not to x.
code good style:
- Don’t change types arbitrarily.
- The choice of variable names is a great way of commenting your code, use variable names that make sense.
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