How to correctly replace data in text files based on input

Question

I have the following problem. Im trying to replace the name based on the input of gender. If anyone could help improve my code it would be really appreciated.

The text file(duedate.txt):

User: Tommy

Gender: Male

Date due: 2020-02-18

The code I have so far is:

with open f = ('duedate.txt).read()
    z = input("Please select gender to change) 
    zz = input("Please select new name")
    if z == 'female' 
       line.startswith('User'): 
       field, value = line.split(:) 
       value = zz
       print (zz) 

I know the code isn't 100% right but the output, if Jessica was chosen as the name, should be:

User: Jessica

Gender: Female

Date due: 2020-02-18

Answer 1

This should work. Code explanation is given in the comments:

import pandas as pd
import numpy as np

# Read the text file into a dataframe
df = pd.read_csv('duedate.txt', sep = "\n",header=None)

# Do dataframe manipulations
df[['Variable','Value']] = df[0].str.split(':',expand=True)
del df[0]

# Collect inputs from user:
z = input("Please select gender to change")
zz = input("Please select new name")

# modify dataframe based on user inputs
df.loc[0,"Value"]=zz
df.loc[1,"Value"]=z

#Construct output column
df["Output"] = df["Variable"] + ": " + df["Value"] + "\n"

# Save the file back to disk
np.savetxt(r'duedate.txt', df["Output"].values,fmt='%s')