Strings In Python Quotes

One downfall of numpy’s optimization of vector operations is that it only occurs on one operation at a time. That is to say, when we are doing the operation A * B + C with numpy vectors, first the entire A * B operation completes, and the data is stored in a temporary vector; then this new vector is added with C. The in-place version of the diffusion code in Example 6-14 shows this quite explicitly. However, there are many modules that can help with this. numexpr is a module that can take an entire vector expression and compile it into very efficient code that is optimized to minimize cache misses and temporary space used. In addition, the expressions can utilize multiple CPU cores (see Chapter 9 for more information) and specialized instructions for Intel chips to maximize the speedup. It is very easy to change code to use numexpr: all that’s required is to rewrite the expressions as strings with references to local variables. The expressions are compiled behind the scenes (and cached so that calls to the same expression don’t incur the same cost of compilation) and run using optimized code. Example 6-19 shows the simplicity of changing the evolve function to use numexpr. In this case, we chose to use the out parameter of the evaluate function so that numexpr doesn’t allocate a new vector to which to return the result of the calculation.

String manipulation. This is incredibly easy in Python.

One of the compelling reasons to switch to Python 3.3+ is that Unicode object storage is significantly cheaper than it is in Python 2.7. If you mainly handle lots of strings and they eat a lot of RAM, definitely consider a move to Python 3.3+. You get this RAM saving absolutely for free.

In Pythons 3.3 and 2.7, you can get help for a module you have not imported by quoting the module’s name as a string — for example, help('re'), help('email.message') — but support for this and other modes may differ across Python versions.

Seibel: Some people love Lisp syntax and some can't stand it. Why is that? Deutsch: Well, I can't speak for anyone else. But I can tell you why I don't want to work with Lisp syntax anymore. There are two reasons. Number one, and I alluded to this earlier, is that the older I've gotten, the more important it is to me that the density of information per square inch in front of my face is high. The density of information per square inch in infix languages is higher than in Lisp. Seibel: But almost all languages are, in fact, prefix, except for a small handful of arithmetic operators. Deutsch: That's not actually true. In Python, for example, it's not true for list, tuple, and dictionary construction. That's done with bracketing. String formatting is done infix. Seibel: As it is in Common Lisp with FORMAT. Deutsch: OK, right. But the things that aren't done infix; the common ones, being loops and conditionals, are not prefix. They're done by alternating keywords and what it is they apply to. In that respect they are actually more verbose than Lisp. But that brings me to the other half, the other reason why I like Python syntax better, which is that Lisp is lexically pretty monotonous.

It’s a way of saying to Python, “Yes, I know I have quotes inside my string, and I want you to ignore them until you see the end quote.

you really want to use single or double quotes to surround a string in Python, instead of three single quotes, you can add a backslash (\) before each quotation mark within the string. This is called escaping.

If your format strings are user-supplied, use Template Strings to avoid security issues. Otherwise, use Literal String Interpolation if you’re on Python 3.6+, and “New Style” String Formatting if you’re not.

nonchalant charminar ma, i can’t smile well-scrubbed twisted-smirks in your noble society anymore in the godly dense ocean of kindness with krishna’s duffed up white teeth with studious eyes of the devil i can’t anymore in a ramakrishnian posture use my wife according to the matriarchal customs substitute sugar for saccharine and dread diabetes no more i can’t no more with my unhappy organ do a devdas again in khalashitola on the registry day of a former fling. my liver is getting rancid by the day my grandfather had cirrhosis don’t understand heredity i drink alcohol read poetry my father for the sake of puja etc used to fast venerable dadas in our para swearing by dharma gently press ripe breasts of sisters-born-of-the-locality on holi on the day ma left for trips abroad many in your noble society had vodka i will nonchalantly from your funeral pyre light up a charminar thinking of your death my eyes tear up then i don’t think of earthquakes by the banks or of floodwater didn’t put my hand on the string of the petticoat of an unmarried lover and didn’t think of baishnab padavali ma, even i’ll die one day. at belur mandir on seeing foreign woman pray with her international python-bum veiled in a skirt my limitless libido rose up ma because your libido will be tied up to father’s memories even beyond death i this fucked up drunk am envying you carrying dirt of the humblest kind looking at my organ i feel as if i’m an organism from another planet now the rays of the setting sun is touching my face on a tangent and after mixing the colour of the setting sun on their wings a flock of non-family-planning birds is going back towards bonolata sen’s eyes peaceful as a nest – it’s time for them to warm the eggs –

Besides directory paths on Windows, raw strings are also commonly used for regular expressions

a raw string cannot end in an odd number of backslashes.