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Boston Python Workshop 8/Friday/Tutorial: Difference between revisions

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Boston Python Workshop 8/Friday/Tutorial (view source)

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</pre>
 
How about printingconcatenating different data types together?▼
===Printing===▼
 
You can print strings using the <code>print</code> function:
 
<pre>
h = "Hello" + 1
w = "World"▼
print(h + w)▼
</pre>▼
 
<pre>▼
my_string = "Alpha " + "Beta " + "Gamma " + "Delta"▼
print(my_string)▼
</pre>▼
 
▲How about printing different data types together?
 
<pre>▼
print("Hello" + 1)
</pre>
 
Hey now! The output from the previous example was really different and interesting; let's break down exactly what happened:
 
<code>>>> print("Hello" + 1)</code><br />
<code>Traceback (most recent call last):</code><br />
<code> File "<stdin>", line 1, in <module></code><br />
Line 266 ⟶ 251:
 
<pre>
print("Hello" + "World")
</pre>
 
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<pre>
print("Hello" + 1)
</pre>
 
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<pre>
print("Hello" + str(1))
</pre>
 
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<pre>
print(len("Hello"))
print(len(""))
fish = "humuhumunukunukuapuaʻa"
lengthname_length = str(len(fish))
print(fish + " is a Hawaiian fish whose name is " + lengthname_length + " characters long.")
</pre>
 
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<pre>
print('Hello')
print("Hello")
</pre>
 
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<pre>
print('I'm a happy camper')
</pre>
 
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<pre>
print("I'm a happy camper")
</pre>
 
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<pre>
print("A" * 40)
print("ABC" * 12)
h = "Happy"
b = "Birthday"
print((h + b) * 10)
</pre>
 
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<pre>
total = 1.5 - 1/2
print(total)
print(type(total))
</pre>
 
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b = "brown"
c = "fox jumps over the lazy dog"
print("The " + a * 3 + " " + b * 3 + " " + c)
</pre>
 
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Take a break, stretch, meet some neighbors, and ask the staff if you have any questions about this material.
 
▲=== Part 2: Printing===
 
So far we've been learning at the interactive <b>Python interpreter</b>. When you are working at the interpreter, any work that you do gets printed to the screen. For example:
 
▲<pre>
h = "Hello"
▲w = "World"
h + w
▲</pre>
 
will display "HelloWorld".
 
Another place that we will be writing Python code is in a file. When we run Python code from a file instead of interactively, we don't get work printed to the screen for free. We have to tell Python to print the information to the screen. The way we do this is with the <b>print</b> function. Here's how it works:
 
▲<pre>
h = "Hello"
w = "World"
▲print(h + w)
▲</pre>
 
<pre>
▲my_string = "Alpha " + "Beta " + "Gamma " + "Delta"
▲print(my_string)
</pre>
 
The string manipulate is exactly the same as before. The only difference is that you need to use <b>print</b> to print results to the screen:
 
<code> h + w</code>
 
becomes
 
<code> print(h + w)</code>
 
We'll see more examples of the print function in the next section.
 
==Python scripts==
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