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Add code example to demonstrate proper string concatenation. #173

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kennethreitz merged 1 commit into from
Jun 14, 2012
Merged

Add code example to demonstrate proper string concatenation. #173

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20 changes: 20 additions & 0 deletions docs/writing/structure.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -391,6 +391,26 @@ its parts, it is much more efficient to accumulate the parts in a list,
which is mutable, and then glue ('join') the parts together when the
full string is needed.

**Bad**

.. code-block:: python

# create a concatenated string from 0 to 19 (e.g. "012..1819")
nums = ""
for n in range(20):
nums += str(n) # slow and inefficient
print nums

**Good**

.. code-block:: python

# create a concatenated string from 0 to 19 (e.g. "012..1819")
nums = []
for n in range(20):
nums.append(str(n))
print "".join(nums) # much more efficient

Vendorizing Dependencies
------------------------

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