Python String format() Metode
Voorbeeld
Voeg die prys in die plekhouer in, die prys moet in vaste punt, twee-desimale formaat wees:
txt = "For only {price:.2f} dollars!"
print(txt.format(price = 49))
Definisie en gebruik
Die format()metode formateer die gespesifiseerde waarde(s) en voeg dit in die string se plekhouer in.
Die plekhouer word gedefinieer met behulp van krullerige hakies: {}. Lees meer oor die plekhouers in die Plekhouer-afdeling hieronder.
Die format()metode gee die geformateerde string terug.
Sintaksis
string.format(value1, value2...)
Parameterwaardes
| Parameter | Description |
|---|---|
| value1, value2... | Required. One or more values that should be formatted and inserted in
the string. The values are either a list of values separated by commas, a key=value list, or a combination of both. The values can be of any data type. |
Die plekhouers
Die plekhouers kan geïdentifiseer word deur benoemde indekse
{price}, genommerde indekse {0}of selfs leë plekhouers
te gebruik {}.
Voorbeeld
Gebruik verskillende plekhouerwaardes:
txt1 = "My
name is {fname}, I'm {age}".format(fname = "John", age = 36)
txt2 = "My
name is {0}, I'm {1}".format("John",36)
txt3 = "My
name is {}, I'm {}".format("John",36)
Formateer tipes
Binne die plekhouers kan jy 'n formateringtipe byvoeg om die resultaat te formateer:
:< |
Left aligns the result (within the available space) | |
:> |
Right aligns the result (within the available space) | |
:^ |
Center aligns the result (within the available space) | |
:= |
Places the sign to the left most position | |
:+ |
Use a plus sign to indicate if the result is positive or negative | |
:- |
Use a minus sign for negative values only | |
: |
Use a space to insert an extra space before positive numbers (and a minus sign before negative numbers) | |
:, |
Use a comma as a thousand separator | |
:_ |
Use a underscore as a thousand separator | |
:b |
Binary format | |
:c |
Converts the value into the corresponding unicode character | |
:d |
Decimal format | |
:e |
Scientific format, with a lower case e | |
:E |
Scientific format, with an upper case E | |
:f |
Fix point number format | |
:F |
Fix point number format, in uppercase format (show
inf and
nan as INF
and NAN) |
|
:g |
General format | |
:G |
General format (using a upper case E for scientific notations) | |
:o |
Octal format | |
:x |
Hex format, lower case | |
:X |
Hex format, upper case | |
:n |
Number format | |
:% |
Percentage format |