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This article introduces the relevant knowledge of "how to use the input,print,eval function of python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Input () function

The input () function can get the user's input through the console. This function can contain prompts to prompt the user for what type of value to enter, or it may not contain prompts.

No matter what value the user enters, the program is treated as a string

Usage

Variable is to get the information entered by the user for operation

Eval () function

The function of the eval function is to remove the outermost pair of quotation marks from the string, and then manipulate the string with the outermost quotation marks removed through the python statement.

Usage

Variable = eval (string) for example abc=eval ("123")

Variable is to get the value after the quotation marks are removed for operation. The input () function is usually used together to get the value entered by the user, using the variable = eval (input ()).

Print function

The first usage: direct output of a single variable or string, numerical value second usage: output multiple values at the same time, using print (value, value,., value), values and values are separated by commas, values and values are separated by spaces. The third use: mixed output is to use a template output, then fill in the corresponding variables on it, use the format function The following uses the example print ("{} between the number {} and the number {}" .format (variable 1, variable 2, variable 3), where the parenthesis is empty, and the following variable corresponds to the parenthesis one by one, and this variable can also be converted into an expression

There is a newline character at the end of the output of the print () function by default. If you want to remove the newline character, you can use the syntax print (variable, end= "symbol of substitution"), and the symbol in the double quotation marks will replace the newline character.

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