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Intro to Programming and Data Science (Spring 2020)/Day 1 Tutorial
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===String Concatenation=== You can combine strings together (called "concatenation") using the '+' sign: "Hello" + "World" name = "Jessica" "Hello " + name How about concatenating different data types? "Hello" + 1 Hey now! The output from the previous example was really different and interesting; let's break down exactly what happened: <code>>>> "Hello" + 1</code><br /> <code>Traceback (most recent call last):</code><br /> <code> File "<stdin>", line 1, in <module></code><br /> <code>TypeError: cannot concatenate 'str' and 'int' objects</code> Again, we get a Traceback. This time, Python gives us a helpful error message as part of the TypeError: <code>"cannot concatenate 'str' and 'int' objects"</code> We saw above the we can concatenate strings: "Hello" + "World" works just fine. However, "Hello" + 1 produces a <code>TypeError</code> because we are telling Python to concatenate a string and an integer, and that's not something Python understands how to do. We can convert an integer into a string ourselves, using the <code>str</code> function: "Hello" + str(1) 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 a Python object as input and produces a string version of that input as output.
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