Notes
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References and copies (deep copy and shallow copy)
first class citizen objects
items = {
'number' : 42
'text' : "Hello World"
}
items["func"] = abs # Add the abs() function
import math
items["mod"] = math # Add a module
items["error"] = ValueError # Add an exception type
nums = [1,2,3,4]
items["append"] = nums.append # Add a method of another object
items["func"](-45)
# Executes abs(-45)
45
>>>
items["mod"].sqrt(4)
# Executes math.sqrt(4)
2.0
>>>
try:
...
x = int("a lot")
...
except items["error"] as e:
# Same as except ValueError as e
...
print("Couldn't convert")
...
Couldn't convert
>>>
items["append"](100)
# Executes nums.append(100)
>>>
nums
[1, 2, 3, 4, 100]
>>>
line = "GOOG,100,490.10"
>>>
field_types = [str, int, float]
>>>
raw_fields = line.split(',')
>>>
fields = [ty(val) for ty,val in zip(field_types,raw_fields)]
>>>
fields
['GOOG', 100, 490.10000000000002]
|
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