转换包含unicode值和浮点数的python列表

Question

So I am reading values from an excel and storing inside a list. But by default, it stored strings as unicode strings and numbers as floats. I want to convert unicode strings into normal strings and float to integer. How do I do that?

Here's my list:

import xlrd 
wb = xlrd.open_workbook("test.xlsx")
firstsheet = wb.sheet_by_index(0)
rows =1
rowvalues = []
while(rows <= (firstsheet.nrows)-1):
     rowvalues.extend(firstsheet.row_values(rows)) 
     rows+=1
print rowvalues

Output:

[121090999.0, 3454554455.0, u'Shantharam', 121090999.0, 5645.0, u'Puranik']

What I need:

[ 121090999,  3454554455,  'Shantharam', 121090999,  5645,  'Puranik' ]

Answer 1

Below is the list comprehension to convert items in list to:

1. str if it is unicode
2. int if it is float
3. Else, append as it is:

Sample Example:

>>> my_list = [121090999.0, 3454554455.0, u'Shantharam', 121090999.0, 5645.0, u'Puranik']
>>> [str(item) if isinstance(item, unicode) else int(item) if isinstance(item,float) else item for item in my_list]
# Output: [121090999, 3454554455, 'Shantharam', 121090999, 5645, 'Puranik']

However, instead of converting list to desired format, you should make these checks ( if conditions) at the time you are extending rowvalues

Answer 2

You can use isinstance to check the type of the variable

rows = [121090999.0, 3454554455.0, u'Shantharam', 121090999.0, 5645.0, u'Puranik']
def convert_rows(rows):
    for kk,vv in enumerate(rows):        
        if isinstance(vv,float):
            rows[kk] = int(vv)
        if isinstance(vv,unicode):
            rows[kk] = vv.encode('ascii')
    return rows
print( convert_rows(rows) )
# prints [121090999, 3454554455L, 'Shantharam', 121090999, 5645, 'Puranik']

Answer 3

Here is a short script that should do the trick:

l=[121090999.0, 3454554455.0, u'Shantharam', 121090999.0, 5645.0, u'Puranik'];
i=0
for i in range(len(l)-1):
        if isinstance(l[i], float):
             l[i]=int(l[i])
        else:
             l[i]=str(l[i])
print(l)

Answer 4

Below is the list comprehension code which does exactly what you want:

   [int(d) if isinstance(d, float) else str(d) if isinstance(d, unicode) else d for d in my_list]

Run this code on your my_list and you'll get the following response:

    new_list = [121090999, 3454554455, 'Shantharam', 121090999, 5645, 'Puranik']

You can verify the datatype of the elements as:

    type(new_list[-1])  # <type 'str'>
    type(new_list[-2])  # <type 'int'>