openpyxl how to read formula result after editing input data on the sheet? data

openpyxl how to read formula result after editing input data on the sheet? data_only=True gives me a “None” result

Using openpyxl, I'm able to read 2 numbers on a sheet, and also able to read their sum by loading the sheet with data_only=True.

However, when I alter the 2 numbers using openpyxl and then try to read the answer using data_only=True, it returns no output. How do I do this?

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

From the docs "data_only controls whether cells with formulae have either the formula (default) or the value stored the last time Excel read the sheet." Notice that neither of those options include evaluating the formula. What you want cannot be done with openpyxl.
– Steven Rumbalski
Nov 12 '18 at 23:58

@Idlehands afraid that doesn't work. 'Cell' object has no attribute 'value2'.
– oktested
Nov 13 '18 at 13:17

@oktested sorry I was in between Python and VBA so got them mixed up a little.
– Idlehands
Nov 13 '18 at 13:43

add a comment |

Using openpyxl, I'm able to read 2 numbers on a sheet, and also able to read their sum by loading the sheet with data_only=True.

However, when I alter the 2 numbers using openpyxl and then try to read the answer using data_only=True, it returns no output. How do I do this?

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

From the docs "data_only controls whether cells with formulae have either the formula (default) or the value stored the last time Excel read the sheet." Notice that neither of those options include evaluating the formula. What you want cannot be done with openpyxl.
– Steven Rumbalski
Nov 12 '18 at 23:58

@Idlehands afraid that doesn't work. 'Cell' object has no attribute 'value2'.
– oktested
Nov 13 '18 at 13:17

@oktested sorry I was in between Python and VBA so got them mixed up a little.
– Idlehands
Nov 13 '18 at 13:43

add a comment |

Using openpyxl, I'm able to read 2 numbers on a sheet, and also able to read their sum by loading the sheet with data_only=True.

However, when I alter the 2 numbers using openpyxl and then try to read the answer using data_only=True, it returns no output. How do I do this?

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

Using openpyxl, I'm able to read 2 numbers on a sheet, and also able to read their sum by loading the sheet with data_only=True.

However, when I alter the 2 numbers using openpyxl and then try to read the answer using data_only=True, it returns no output. How do I do this?

python excel openpyxl

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

edited Nov 13 '18 at 10:51

Aqueous Carlos

293213

asked Nov 12 '18 at 23:39

oktested

asked Nov 12 '18 at 23:39

oktested

asked Nov 12 '18 at 23:39

oktested

From the docs "data_only controls whether cells with formulae have either the formula (default) or the value stored the last time Excel read the sheet." Notice that neither of those options include evaluating the formula. What you want cannot be done with openpyxl.
– Steven Rumbalski
Nov 12 '18 at 23:58

@Idlehands afraid that doesn't work. 'Cell' object has no attribute 'value2'.
– oktested
Nov 13 '18 at 13:17

@oktested sorry I was in between Python and VBA so got them mixed up a little.
– Idlehands
Nov 13 '18 at 13:43

add a comment |

From the docs "data_only controls whether cells with formulae have either the formula (default) or the value stored the last time Excel read the sheet." Notice that neither of those options include evaluating the formula. What you want cannot be done with openpyxl.
– Steven Rumbalski
Nov 12 '18 at 23:58

@Idlehands afraid that doesn't work. 'Cell' object has no attribute 'value2'.
– oktested
Nov 13 '18 at 13:17

@oktested sorry I was in between Python and VBA so got them mixed up a little.
– Idlehands
Nov 13 '18 at 13:43

From the docs "data_only controls whether cells with formulae have either the formula (default) or the value stored the last time Excel read the sheet." Notice that neither of those options include evaluating the formula. What you want cannot be done with openpyxl.
– Steven Rumbalski
Nov 12 '18 at 23:58

@Idlehands afraid that doesn't work. 'Cell' object has no attribute 'value2'.
– oktested
Nov 13 '18 at 13:17

@oktested sorry I was in between Python and VBA so got them mixed up a little.
– Idlehands
Nov 13 '18 at 13:43

add a comment |

2 Answers
2

active

oldest

votes

You can have either the value or the formula in openpyxl. It is precisely to avoid the confusion that this kind of edit could introduce that the library works like this. To evaluate the changed formulae you'll need to load the file in an app like MS Excel or LibreOffice that can evaluate the formulae and store the results.

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

add a comment |

openpyxl data_only flag set to true only get the formula evaluated value when load the file.
Even more, the data_only can only get the value if some tool such as MS Excel already evaluated the formula and stored the cached value, or openpyxl will get None.
I found it from this answer

answered Nov 13 '18 at 9:39

cuble

15617

add a comment |

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2 Answers
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2 Answers
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answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

add a comment |

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

add a comment |

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

answered Nov 13 '18 at 8:20

Charlie Clark

9,72322233

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

add a comment |

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

Nice to get a reply from the man himself. Congrats on the work so far and pls keep going! I'm not changing the formula itself - I just want to use the same formula on a new set of inputs that I'm entering into excel using openpyxl. Basically I have a complex sheet of formulas already and I need openpyxl to repeatedly use those formulas on new inputs, and read the results back to python. I presume this is not possible in openpyxl? This would make openpyxl super-powerful (context: I'm an investment banker from the fixed income space, trying to upgrade my skills with some python). Thnx!
– oktested
Nov 13 '18 at 13:13

You could now write your own formula engine with the tokeniser but that way madness lies (dependencies and possible infitite loops). Excel and LibreOffice have optimisations for that, so much better to make the changes in openpyxl and let them do the calculations, especially as you can remote control them.
– Charlie Clark
Nov 13 '18 at 14:06

Apologies - I didn't understand your reply. By "write your own formula engine with the tokeniser", are you referring to making all the formulas in Python instead of excel, so as to leave Excel altogether? Secondly, when you say, "make the changes in openpyxl and let them do the calculations", the "them" refers to Excel? Sorry I'm not clear what your recommendation is.
– oktested
Nov 14 '18 at 4:02

add a comment |

answered Nov 13 '18 at 9:39

cuble

15617

add a comment |

answered Nov 13 '18 at 9:39

cuble

15617

add a comment |

answered Nov 13 '18 at 9:39

cuble

15617

answered Nov 13 '18 at 9:39

cuble

15617

answered Nov 13 '18 at 9:39

cuble

15617

answered Nov 13 '18 at 9:39

cuble

15617

answered Nov 13 '18 at 9:39

cuble

15617

add a comment |

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