Python example method to convert the string to float

In this article Xiaobian to share with you about Python instance method to convert the string to float and related knowledge, need friends refer to the
How to convert string to float Python? Simple steps, let you easily solve.

Open Software python new project, as shown in FIG

context menu .py files created, as shown

in step file input code is as follows:

def string_to_float(str):
 
return float(str)
 
if __name__ == '__main__':
 
str = '3.1415926'
 
res = string_to_float(str)
 
print(res + 1)

After the blank menu, select [Run 'test']
See results are shown in FIG operation
needs to be converted to string float, you can directly call the function of FIG.
Knowledge Point Spread

python str converted into float

Using a map and reduce str2float write function, the string '123.456' into float 123.456

fromfunctoolsimportreduce
  
defstr2float(s):
 returnreduce(lambdax,y:x+int2dec(y),map(str2int,s.split('.')))
defchar2num(s):
 return{'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9}[s]
defstr2int(s):
 returnreduce(lambdax,y:x*10+y,map(char2num,s))
defintLen(i):
 returnlen('%d'%i)
defint2dec(i):
 returni/(10**intLen(i))
   
print(str2float('123.456'))

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