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<pre>
"Hello" + "World"
</pre>▼
<pre>▼
name = "Jessica"
print "Hello " + name
</pre>
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</pre>
Python is actually turning the integer 1 into a string before printing, and that's why
We can convert an integer into a string ourselves, using the <code>str</code> function:
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</pre>
Like the <code>type</code> function from before, the <code>str</code> function takes 1 argument. In the above example it took the integer 1. <code>str</code> takes
===String length===
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</pre>
This gives us another <b>traceback</b>, for a new kind of error, a <code>SyntaxError</code>. When Python looks at that expression, it sees the string 'I' and then
<code>m a happy camper'</code>
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A <b>function signature</b> tells you how the function will be called. It starts with the keyword <code>def</code>, which tells Python that you are defining a function. Then comes a space, the name of your function, an open parenthesis, the comma-separated input <b>parameters</b> for your function, a close parenthesis, and a colon. Here's what a function signature looks like for a function that takes no arguments:
<code>def myFunction():</code>▼
▲<pre>
▲def myFunction():
▲</pre>
Here's what a function signature looks like for a function that takes one argument called <code>string</code>:
<code>def myFunction(string):</code>▼
▲def myFunction(string):
And one for a function that takes two arguments:
<code>def myFunction(myList, myInteger):</code>▼
▲def myFunction(myList, myInteger):
Parameters should have names that usefully describe what they are used for in the function.
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Learning about functions opens up a whole new way for us to practice, using the programming site [http://codingbat.com codingbat.com]. The big goal of this practice section is to get you thinking about how to solve problems in Python.
Please visit http://codingbat.com/home/jessica.mckellar@gmail.com/Friday to complete the practice problems. You don't have to create a CodingBat account to do the exercises, but if you do create an account it'll keep track of which problems you've completed and other statistics.
==End of Part 2==
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