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--- development:python:strings [12/09/2022 00:30] – [srtring fill] mate
+++ development:python:strings [10/10/2024 00:53] (actual) – [f-strings (Literal String Interpolation)] mate
@@ Línia 1: / Línia 1: @@
 = Python strings
+{{tag>python}}
 == comp
   * Exact match (equality comparison): ==, !=
@@ Línia 13: / Línia 14: @@
     * ''"string%s"%(param1)''
     * ''"string {} {}".format(1parm,2param)''
-    * ''"string {1}{2}{1}".format(1param,2param"''
+    * ''"string {1}{2}{1}".format(1param,2param)''
-    * interpolación: ''f"string {name} {a + b}"''
+    * interpolación (f-string): ''f"string {name} {a + b}"''
     * Template strings
-== srtring fill
+== f-strings (Literal String Interpolation)
+  * To create an f-string, prefix the string with the letter “ f ”. The string itself can be formatted in much the same way that you would with str.format(). F-strings provide a concise and convenient way to embed python expressions inside string literals for formatting.
+  * F-strings are faster than the two most commonly used string formatting mechanisms, which are % formatting and str.format().
+<code python>
+val = 'Geeks'
+print(f"{val}for{val} is a portal for {val}.")
+</code>
+<code python>
+import datetime
+today = datetime.datetime.today()
+print(f"{today:%B %d, %Y}")
+</code>
+Backslash Cannot be used in format string directly.
+<code python error>
+f"newline: {ord('\n')}"
+</code>
+<code python correcto>
+newline = ord('\n')
+print(f"newline: {newline}")
+</code>
+/+info: [[https://www.python.org/dev/peps/pep-0498/]]
+/via: [[https://www.geeksforgeeks.org/formatted-string-literals-f-strings-python/]]
+== string fill
   * ''ljust()'', ''rjust()'', ''center()''
   * ''%15s'', ''%15-s''
   * ''{:15}'', ''{:>15}''
 /via:[[https://www.delftstack.com/es/howto/python/python-pad-string-with-spaces/]]
+  * ''zfill()''
+== zero fill
+  * ''n=42''
+  * ''print(f'{n:05d}')''
+  * ''print('%05d' % n)''
+  * ''print('{0:05d}'.format(n))''
+  * 00042
+ /via: [[https://www.python-engineer.com/posts/pad-zeros-string/]]
+== concatenate
+  * ''s1+s2''
+  * ''"%s %s"%(s1,s2)''
+  * ''"-".join([s1,s2])''
+  * ''"{}{}".format(s1,s2)''
+/via: [[https://www.tutorialspoint.com/how-to-concatenate-two-strings-in-python]]