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[英]Can I display a Dataframe in Output form from within a while loop?
[英]How can I create multiple output files within a while loop?
我設法寫了一個文件,里面有一些數據。 但是,無論我做什么,當我希望while循環的每次迭代都使用不同名稱的不同輸出文件時,我只能得到一個輸出文件進行代碼的最終迭代(這會更改S0的初始條件):
# zombie apocalypse modeling
import numpy as np
import matplotlib.pyplot as plt
from scipy.integrate import odeint
import pandas as pd
plt.ion()
plt.rcParams['figure.figsize'] = 10, 8
P = 0 # birth rate
d = 0.0001 # natural death percent (per day)
B = 0.0095 # transmission percent (per day)
G = 0.0001 # resurect percent (per day)
A = 0.0001 # destroy percent (per day)
# solve the system dy/dt = f(y, t)
def f(y, t):
Si = y[0]
Zi = y[1]
Ri = y[2]
# the model equations (see Munz et al. 2009)
f0 = P - B*Si*Zi - d*Si
f1 = B*Si*Zi + G*Ri - A*Si*Zi
f2 = d*Si + A*Si*Zi - G*Ri
return [f0, f1, f2]
# initial conditions
S0 = 500. # initial population
Z0 = 0 # initial zombie population
R0 = 0 # initial death population
while S0 < 600
S0 += 5
y0 = [S0, Z0, R0] # initial condition vector
t = np.linspace(0, 5., 1000) # time grid
# solve the DEs
soln = odeint(f, y0, t)
S = soln[:, 0]
Z = soln[:, 1]
R = soln[:, 2]
df = pd.dataframes({S,Z,R]}
df.to_csv('test.txt', sep='\t')
如何才能做到這一點?
import os
for k in range(1,10):
# some loop
with open("myfile.{}.csv".format(k), "w") as f: # put a counter inside the files name
f.write("some data")
print( os.listdir("./"))
輸出:
['myfile.8.csv', 'myfile.7.csv', 'myfile.6.csv', 'myfile.4.csv',
'myfile.5.csv', 'main.py', 'myfile.9.csv', 'myfile.1.csv',
'myfile.2.csv', 'myfile.3.csv']
我們可以確定文件是否存在,然后自動對其進行遞增:
import os
import datetime
def newName(baseName):
"""Checks if baseName exists, if not inserts a running
counter and increments it until file does not exist."""
n = baseName[:-4]+".{}"+baseName[-4:] # assumes a len-3 filenameextension like txt
if not os.path.exists(baseName):
return baseName
i = 0
while os.path.exists( n.format(i)):
i+=1
return n.format(i)
with open(newName("myfile.csv"),"w") as f: # newName checks and creates a unique name
f.write("some data")
with open(newName("myfile.csv"),"w") as f: # if the file already exists.
f.write("some data")
with open(newName("myfile.csv"),"w") as f:
f.write("some data")
print( os.listdir("./"))
輸出:
['myfile.1.csv', 'myfile.csv', 'myfile.0.csv', 'main.py']
在while循環中創建一個計數器,並在每次要更改輸出文件的迭代中將其遞增。 根據計數器值選擇要使用的文件。
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