Python could not convert string to float

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. If you want to use float number to compare, the game may be endless because a float number has many fractional digits. Use int number. That way you will be concatenating a string with a string.

Also, you can keep random. Then use try. This will try to convert guess into a float, and it that fails, then it will remain a string. That should solve your problem. You could isolate concerns by defining a function that asks user for input until a float is provided:.

Learn more. Could not convert string to float in input Ask Question. Asked 6 years, 4 months ago. Active 6 years, 4 months ago. Viewed 1k times. My code should take a random between 1 and and let you guess it. Also I am only programming for just a few weeks so sorry if my code looks wrong. Could you fix up the indentation please? What are you actually inputting in your program?

String to float?

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You could totally find that on pydocs or google in seconds. This question is not particularly useful, and seriously lacks research. Welcome to SO! Active Oldest Votes. Hugh Bothwell Hugh Bothwell It doesn't work for numbers like And when I add float to the input it just breaks. Why on Earth would you ever play the guessing game with floating-point numbers? It takes the number of guesses required from "about 8" to "about 30"; it's the same as playing "guess the number between 1 and 4.

Use random. AHuman AHuman 1, 3 3 gold badges 14 14 silver badges 25 25 bronze badges. This doesn't actually do anything. Then try using random. See edit above.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

In Python, how can I parse a numeric string like " Or parse the string "31" to an integer, 31? I just want to know how to parse a float str to a floatand separately an int str to an int. Catching broad exceptions this way, killing canaries and gobbling the exception creates a tiny chance that a valid float as string will return false.

The float But if you're writing life-critical software in a duck-typing prototype language like Python, then you've got much larger problems. This is another method which deserves to be mentioned here, ast. This can be used for safely evaluating strings containing Python expressions from untrusted sources without the need to parse the values oneself.

You should consider the possibility of commas in the string representation of a number, for cases like float ", Instead, use methods in locale to convert the strings to numbers and interpret commas correctly. The locale. In the United States and the UK, commas can be used as a thousands separator. In this example with American locale, the comma is handled properly as a separator:.

In the majority of countries of the worldcommas are used for decimal marks instead of periods. In this example with French locale, the comma is correctly handled as a decimal mark:. If you aren't averse to third-party modules, you could check out the fastnumbers module. Users codelogic and harley are correct, but keep in mind if you know the string is an integer for example, you can call int "" without first casting to float.Please read the Help Documents before posting.

Hello There, Guest! Login Register. Login Username: Password: Lost Password? Remember me. Thread Rating: 0 Vote s - 0 Average 1 2 3 4 5. Thread Modes. BoaCoder3 Programmer named Tim. In this programme i'm trying to solve a mathematical ratio problem, then calculate the squareroot, however, whenever i try to give it input like this: 2.

Windspar Minister of Silly Walks. Python does recognize '. You need to print ratio. To see your error. View a Printable Version Subscribe to this thread. Default Dark Midnight. Linear Mode. Threaded Mode. Lost Password? BoaCoder3 Programmer named Tim Posts: 9 Threads: 6 Joined: Nov Reputation: 0 Likes received: 0 1 Jan, PM In this programme i'm trying to solve a mathematical ratio problem, then calculate the squareroot, however, whenever i try to give it input like this: 2.

Edited 1 time in total. How do I convert this string back to a list of integers? Apr, PM Last Post : donmerch. Python convert multi line into single line formatted string. Dec, PM Last Post : karthidec. How to check if user entered string or integer or float?? Dec, AM Last Post : buran. Oct, PM Last Post : ichabod Jul, PM Last Post : scidam. Jul, AM Last Post : metulburr.

ValueError: could not convert string to float.

python could not convert string to float

Jun, PM Last Post : micseydel.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm confused by this. When I try this for only one line in interactive section, instead of for loop using script:.

Obviously some of your lines don't have valid float data, specifically some line have text id which can't be converted to float. When you try it in interactive prompt you are trying only first line, so best way is to print the line where you are getting this error and you will know the wrong line e.

My error was very simple: the text file containing the data had some space so not visible character on the last line. Somewhere in your text file, a line has the word id in it, which can't really be converted to a number. In my case, the font I was using meant that "l" and "1" looked very similar.

I had a string like 'l' which I thought was '' and that messed things up. I solved the similar situation with basic technique using pandas.

First load the csv or text file using pandas. It's pretty simple. Then set the index of data to the respected column that needs to be changed. For example, if your data has ID as one attribute or column, then set index to ID. Learn more. ValueError: could not convert string to float: id Ask Question. Asked 8 years, 4 months ago. Active 6 months ago. Viewed k times. I'm running the following python script:! Can anyone explain a little bit about this?

Thank you. Rodrigo Vargas 10 10 bronze badges. Active Oldest Votes.

How do I use string methods in pandas?

Anurag Uniyal Anurag Uniyal Zoe 20k 12 12 gold badges 77 77 silver badges bronze badges. Sopalajo de Arrierez Sopalajo de Arrierez 2, 3 3 gold badges 25 25 silver badges 37 37 bronze badges. This error is pretty verbose: ValueError: could not convert string to float: id Somewhere in your text file, a line has the word id in it, which can't really be converted to a number.

Your test code works because the word id isn't present in line 2. If you want to catch that line, try this code. I cleaned your code up a tad:! Blender Blender k 39 39 gold badges silver badges bronze badges. Perhaps your numbers aren't actually numbers, but letters masquerading as numbers? Tom Roth Tom Roth 8 8 silver badges 18 18 bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field. It only takes a minute to sign up. I have a 2M, 23 dimensional numpy array X. I realize that some characters are not read properly in the dataframe, and the unicode replacement character is just a result of it. Though not the best solution, I found some success by converting it into pandas dataframe and working along.

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String to float conversion with python

Active 2 months ago. Viewed 47k times. My questions:- How do I handle this misreading? Should I ignore these characters? Or should I transform them to zero maybe?

Additional Information on how the data was read:- importing relevant packages from pyspark import SparkContext from pyspark. Active Oldest Votes. Gal Dreiman 4 4 bronze badges. Yogesh Yogesh 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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As you can see, the program asks for how many miles you can walk and gives you a response depending on what you type in. The problem is exactly what the Traceback log says: Could not convert string to float. It can't convert arbitrary alphanumeric strings, notably including 'How am I supposed to know?

Learn more. Confusing python - Cannot convert string to float Ask Question.

python could not convert string to float

Asked 6 years, 5 months ago. Active 2 months ago. Viewed 63k times. I got a value error and even if I try playing around with the code, it doesn't work! How can I get it right? Here is the code: As you can see, the program asks for how many miles you can walk and gives you a response depending on what you type in.

This is the code in text format: print "Welcome to Healthometer, powered by Python Go and walk miles now! Keep it up! Try doing 10 miles" else: print "Please type in a number! Try doing 10 miles". Turbo Turbo 2 2 gold badges 4 4 silver badges 15 15 bronze badges.

Why has it been voted down four times? I corrected everything. Active Oldest Votes. The problem is exactly what the Traceback log says: Could not convert string to float If you have a string with only numbers, python's smart enough to do what you're trying and converts the string to a float. If you have a string with non-numerical characters, the conversion will fail and give you the error that you were having. When eventually it succeeds, it'll break from the loop and go to the code you put lower down.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have some values is csv file and In csv file some values are numeric and some are string number. Example of csv file:. The problem is that your string is not just ' It also contains speech marks ". This means that before you convert this to a float, you need to remove the leading and trailing speech marks.

Luckily, Python has a very handy string method.

python could not convert string to float

In this case, you want to strip row[1] of the leading and trailing " characters. You can do this very easily:.

Other conversions, ints to and from strings and literals:

It is obvious that the double quotes cause the problem, Python can only convert a string of numbers and the decimal symbol to a float. One way to remove the double-quotes are using a regular expression. This allows you to run the same code, regardless whether the input has the double-quotes or not:.

It returns a list of length three, of which the second item contains the number. This can then be converted to a float. The second field in your csv is quoted with ". In csv, having quoted fields does not mean those are strings, but that the field could contain a delimiter, like ",45".

Removing the quotes afterwards not only adds extra work, but can also lead to errors if the field contains a delimiter. For example ",45" would return " and 45" as two different fields. Learn more. Asked 2 years, 3 months ago. Active 2 years, 3 months ago.

Viewed 21k times. Example of csv file: 1," ValueError: could not convert string to float: '" You are trying to convert a string into float. Try to remove " " from " Notice the double quotes in the error message Strip off the quotes, and then try converting it. Active Oldest Votes.

python could not convert string to float

You can do this very easily: row[1]. Tom de Geus 3, 1 1 gold badge 17 17 silver badges 44 44 bronze badges. This allows you to run the same code, regardless whether the input has the double-quotes or not: import re print float re.