Several useful spacing & kerning strings, plus a simple way to make your own!

make-kerning-string.py

"""
    A simple way to make some kerning strings, for kerning and/or proofing your kerning.

    Change the "side1Names" to glyphs you want on the left side of pairs, and change side2Names to glyphs you want on the right side of pairs.

    INSTRUCTIONS:
    1. Copy space-separated list(s) of glyph names from a font editor, then paste into side1Names and side2Names below
      - In GlyphsApp, select the glyphs you want, right-click (or control-click) and select Copy Glyph Names > Space Separated
      - In RoboFont,  select the glyphs you want, then press OPTION + COMMAND + C
    2. Paste those names in the glyphNames variable below, between the quotes
    3. Run this script. 
      - You could copy & paste it into the Glyphs Macro Panel or the RoboFont Script Window, then run it.
      - You could alternatively run this anywhere else on your system that runs Python.
    4. Copy the output text, then paste that into your font editor.
    5. Kern away!

    By default, this makes a permutation list of non-flat sided uppercase glyphs, A–Z. 
    
    You might instead wish to do things like:
    - Basic letters and basic trailing punctuation:
        - side1Names = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z"
        - side2Names = "period comma question quotesingle quoteright colon semicolon"
    - Basic letters and basic leading punctuation:
        - side1Names = "period questiondown quotesingle quoteleft quoteright"
        - side2Names = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z"
    - Uppercase diagonals (and glyphs with irregular sides):
        - side1Names = "A F J K L T V W X Y"
        - side2Names = "A F J K T V W X Y"
    - Uppercase against lowercase:
        - side1Names = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
        - side2Names = "a b c d e f g h i j k l m n o p q r s t u v w x y z"
    - Uppercase "overhanging glyphs" against lowercase diacritics:
        - side1Names = "F T V W Y"
        - side2Names = "a aacute abreve acircumflex adieresis agrave amacron aogonek aring atilde ae b c cacute ccaron ccedilla d eth dcaron dcroat e eacute ecaron ecircumflex edieresis edotaccent egrave emacron eogonek f g gcommaaccent h i idotless iacute icircumflex idieresis igrave ij imacron iogonek j jdotless k kcommaaccent l lacute lcaron lcommaaccent lslash m n nacute ncaron ncommaaccent ntilde o oacute ocircumflex odieresis ograve ohungarumlaut omacron oslash otilde oe p thorn q r racute rcaron rcommaaccent s sacute scaron scedilla germandbls t tcaron tcedilla u uacute ucircumflex udieresis ugrave uhungarumlaut umacron uogonek uring v w wacute wcircumflex wdieresis wgrave x y yacute ycircumflex ydieresis ygrave z zacute zcaron zdotaccent" # etc ... or maybe be logical and only use pairs that exist in the real world (requires research)!
    - Non-flat sided uppercase glyphs, A–Z.
        - side1Names = "A B C D E F G I J K L O P Q R S T U V W X Y Z"
        - side2Names = "A C G I J O Q S T U V W X Y Z"
    
    Etcetera! This is basically just a (very) simplified version of something like MetricsMachine’s pair list builder (without
    several of its useful options, like compressing groups or adding open/closing punctuation). But, this approach
    can be still be handy for proofing, working in GlyphsApp, and more!

"""

# space-separate list of glyph names for glyphs you want on the left side of pairs
side1Names = "A F J K L T V W X Y"

# space-separate list of glyph names for glyphs you want on the right side of pairs
side2Names = "A F J K T V W X Y"

# configure the kerning string patter, if you want to adjust it. side1 glyphs will replace $1, and side2 glyphs will replace $2.
# add "\\n" at the end of your pattern if you want your output to include newlines, e.g. for the RoboFont space center
pattern = f"HH$1$2HO$1$2OO nn$1$2no$1$2oo"

for glyphSide1 in side1Names.split(" "):
    for glyphSide2 in side2Names.split(" "):
        print(pattern.replace("$1",f"/{glyphSide1} ").replace("$2",f"/{glyphSide2} "))

make-spacing-string.py

"""
    A simple way to make an arbitrary spacing string.

    INSTRUCTIONS:
    1. Copy a space-separated list of glyph names from a font editor
      - In GlyphsApp, select the glyphs you want, right-click (or control-click) and select Copy Glyph Names > Space Separated
      - In RoboFont,  select the glyphs you want, then press OPTION + COMMAND + C
    2. Paste those names in the glyphNames variable below, between the quotes
    3. Run this script. 
      - You could copy & paste it into the Glyphs Macro Panel or the RoboFont Script Window, then run it.
      - You could alternatively run this anywhere else on your system that runs Python.
    4. Copy the output text, then paste that into your font editor.
    5. Space away!
"""

# copy these from your font editor as space-seperated glyph names
glyphNames = "period comma colon semicolon ellipsis exclam exclamdown question questiondown periodcentered bullet asterisk numbersign slash backslash"

for name in glyphNames.split(" "):
    print(f"HH/{name} HHOO/{name} OO") # space glyphs between HH and OO
    print(f"nn/{name} nnoo/{name} oo") # space glyphs between nn and oo

spacing-string-basic-lowercase.txt

nnnooonono
nnannooaoo
nnbnnooboo
nncnnoocoo
nndnnoodoo
nnennooeoo
nnfnnoofoo
nngnnoogoo
nnhnnoohoo
nninnooioo
nnjnnoojoo
nnknnookoo
nnlnnooloo
nnmnnoomoo
nnnnnoonoo
nnonnooooo
nnpnnoopoo
nnqnnooqoo
nnrnnooroo
nnsnnoosoo
nntnnootoo
nnunnoouoo
nnvnnoovoo
nnwnnoowoo
nnxnnooxoo
nnynnooyoo
nnznnoozoo

spacing-string-basic-numerals.txt

HHH0000HHH
HH0HH00000
HH1HH00100
HH2HH00200
HH3HH00300
HH4HH00400
HH5HH00500
HH6HH00600
HH7HH00700
HH8HH00800
HH9HH00900
0123456789

spacing-string-basic-punctuation.txt

HH/period HHOO/period OO
HH/comma HHOO/comma OO
HH/colon HHOO/colon OO
HH/semicolon HHOO/semicolon OO
HH/ellipsis HHOO/ellipsis OO
HH/exclam HHOO/exclam OO
HH/exclamdown HHOO/exclamdown OO
HH/question HHOO/question OO
HH/questiondown HHOO/questiondown OO
HH/periodcentered HHOO/periodcentered OO
HH/bullet HHOO/bullet OO
HH/asterisk HHOO/asterisk OO
HH/numbersign HHOO/numbersign OO
HH/slash HHOO/slash OO
HH/backslash HHOO/backslash OO

spacing-string-basic-uppercase.txt

HHAHHOOAOO
HHBHHOOBOO
HHCHHOOCOO
HHDHHOODOO
HHEHHOOEOO
HHFHHOOFOO
HHGHHOOGOO
HHHHHOOHOO
HHIHHOOIOO
HHJHHOOJOO
HHKHHOOKOO
HHLHHOOLOO
HHMHHOOMOO
HHNHHOONOO
HHOHHOOOOO
HHPHHOOPOO
HHQHHOOQOO
HHRHHOOROO
HHSHHOOSOO
HHTHHOOTOO
HHUHHOOUOO
HHVHHOOVOO
HHWHHOOWOO
HHXHHOOXOO
HHYHHOOYOO
HHZHHOOZOO