Diff for "Python/FStringsAndFormatting"

Differences between revisions 1 and 8 (spanning 7 versions)

Python Fstring formatting

f - string is the latest python string formatting addition, added in 3.5
- an f-string is created by prefixing the string with a f e.g.
```
f"this is a f-string"
```

Examples of f-strings

numbers f'{value:{width}.{precision}f}'

 a= 10.1234
 >>> f'{a:.2f}'
 '10.12'


>>> f'{a*1000:,.2f}'
'10,123.40'

>>> f'{75.765367:.0f}'
'76'

date

>>> f'test-{datetime.datetime.now():%Y-%m-%d_%H:%M:%S}.txt'
'test-2019-01-29_17:53:37.txt'

unix date time stamp ( seconds since 1970-01-01 )
```
f"{datetime.datetime.utcnow():%s}"
```

timestamp with timezone

tz = datetime.timezone.utc
ft = "%Y-%m-%dT%H:%M:%S%z"
t = datetime.datetime.now(tz=tz).strftime(ft)
print(f"== Summary {t} ==")

== Summary 2020-02-19T22:48:17+0000 ==

-  ⇤ ← Revision 1 as of 2019-01-29 04:27:19 → 
  Size: 110
  Editor: PieterSmit
  Comment:
+   ← Revision 8 as of 2020-02-19 22:52:18 → ⇥
  Size: 892
  Editor: PieterSmit
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
+## page was renamed from Python/FstringFromating
-Line 3:
+Line 4:
+   * an f-string is created by prefixing the string with a f  e.g. {{{
f"this is a f-string"
     }}}

== Examples of f-strings ==
 * numbers f'{value:{width}.{precision}f}'  {{{
 a= 10.1234
 >>> f'{a:.2f}'
 '10.12'


>>> f'{a*1000:,.2f}'
'10,123.40'

>>> f'{75.765367:.0f}'
'76'
    }}}

 * date {{{
>>> f'test-{datetime.datetime.now():%Y-%m-%d_%H:%M:%S}.txt'
'test-2019-01-29_17:53:37.txt'

}}}
 * unix date time stamp ( seconds since 1970-01-01 ) {{{
f"{datetime.datetime.utcnow():%s}"
}}}

 * timestamp with timezone {{{
tz = datetime.timezone.utc
ft = "%Y-%m-%dT%H:%M:%S%z"
t = datetime.datetime.now(tz=tz).strftime(ft)
print(f"== Summary {t} ==")

== Summary 2020-02-19T22:48:17+0000 ==
}}}