import tkinter as tk

w = tk.Tk()

p_name = tk.StringVar(w)
cpus = tk.StringVar(w)
cyc = tk.StringVar(w)
N_ts = tk.StringVar(w)
T_cyc = tk.StringVar(w)

def getvars(p_name, cpus, cyc, N_ts, T_cyc):
     p_name = p_name.get()
     cpus = cpus.get()
     cyc = cyc.get()
     N_ts = N_ts.get()
     T_cyc = T_cyc.get()

     print(T_cyc)

field1 = tk.Label(w, text="project name").grid(row=0, column=0)
entry1 = tk.Entry(w, textvariable = p_name).grid(row=0, column=1)

field2 = tk.Label(w, text="CPUs").grid(row=1, column=0)
entry2 = tk.Entry(w, textvariable = cpus).grid(row=1, column=1)

field3 = tk.Label(w, text="number of cycles").grid(row=2, column=0)
entry3 = tk.Entry(w, textvariable = cyc).grid(row=2, column=1)

field4 = tk.Label(w, text="number of time steps").grid(row=3, column=0)
entry4 = tk.Entry(w, textvariable = N_ts).grid(row=3, column=1)

field5 = tk.Label(w, text="cycle periode").grid(row=4, column=0)
entry5 = tk.Entry(w, textvariable = T_cyc).grid(row=4, column=1)

button = tk.Button(w, text="Get vars", command=getvars(p_name, cpus, cyc, N_ts, T_cyc)).grid(row=5)


w.mainloop()