Python built-in type continuation

Python built-in type continuation

Python does not allow you to use a variable that is not assigned a value. This will cause an exception.

Python assignment:

Assign multiple values at a time: Use the constant value of Tuple to assign Tuple to variable values of the same number.

You can use the Print function. _ doc _ to view most documents in Python. That is, every object in basic Python has an attribute such as _ doc.

Format String:

Python supports formatted string output.

The most basic usage is to insert a value into a string with the string format character % s (note that s is a lower-case Python case sensitive.

>>> K = "Uid"

>>> V = "SA"

>>> "% S = % s" % (K, V) Note that (K, V) is a Tuple

'Uid = Sa'

Only the Tuple of an element: Tup = (A,) must have A comma before the parentheses, so that Python can identify this as A Tuple ..

The % f format character option corresponds to a decimal floating point number, which can specify the decimal precision.

%. 2f indicates that only two decimal places are printed.

Ing List

One of the powerful features of Python is its List parsing. It provides a compact method that maps a List to another by applying a function to each element in the List.

Parse the List without changing the original List.

The Join function can link any List containing strings to a single string! String Join method!

The Join function can only be used for the List where the element is a string! It does not perform any forced type conversion.

The split method can split the string into a List.

Split can have a second parameter, indicating the number of splits!

Tip: search by split

Anythin. split (delimiter, 1) is a useful technique. You can search for a substring and then separate the first and last parts of the string.

June