0 Fundamentals python-7.6 String formatting expressions

String formatting agrees to run multiple specific types of substitutions on a string in a single step

Especially when prompted by the user, formatting is very convenient

Implementation method:

1. Formatting expressions, similar to C-voice printf

In an expression, we use the% binary operator

>>> print (' This was%d%s bird '% (1, ' dead ')) This is 1 dead bird

Give the example above (note that the% we are talking about is the same as the one in the middle of the string and the tuple)

Place a string on the left side of%. One or more embedded objects with a% start in the string are placed inside

Put one (or more) on the right of%. Embedded tuples where the objects are inserted into the left translation target location

When multiple objects are inserted. They need to be put into a tuple.

2. Advanced Format expressions

String Formatting code list

Code	Significance
S	String (or whatever object)
R	S, but with repr instead of STR
C	Character
D	Decimal integer
I	Integer
U	No number integer
O	Eight-binary integers
X	hexadecimal integer
X	X. But print uppercase
E	Floating point Index
E	E, but print uppercase
F	Floating point Decimal
F	Floating point Decimal
G	Floating point E or F
G	Floating point E or F
%	constant

%[(name)][flags][width][.pression]typecode

Sample Example

>>> x=1234>>> res= ' integers:...%d...%-6d...%06d '% (x,x,x) >>> res ' integers: ... 1234...1234  

%e,%f,%g There are differences in the printing of floating-point numbers

3. Dictionary-based formatting expressions

To put it bluntly is to give each alternate location a name, so the code looks clearer

Here we are, thank you.

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0 Fundamentals python-7.6 String formatting expressions