如何解决如何不运行会出错的块
我正在制作一个 html 文件，其中包含每周更新的图像。我正在使用 Rmarkdown 文件来指定图像的文件路径：
# -*- coding: Latin-1 -*-
import os
import math
import tkinter as tk
from tkinter import *
from tkinter import font
# Create an invisible root window.
root = tk.Tk()
root.attributes("-alpha",0.0)
# Create a Toplevel for the application.
win = tk.Toplevel(root)
win.overrideredirect(True)
win.geometry('+400+100')
# Make root forward taskbar minimize and restore events to Toplevel instance.
root.bind("<Unmap>",lambda _: win.withdraw())
root.bind("<Map>",lambda _: win.deiconify())
font1 = font.Font(family = 'Helvetica',size = 15)
font3 = font.Font(family = 'Helvetica',size = 8,weight = 'bold')
font2 = font.Font(family = 'Helvetica',size = 20,weight = 'bold')
def aaa(colora,colorb,colorc,colord,colore,colorf):
Dark = Theme('#18181F','#0C0C0F',"#505063",'#D1DDFF','#D12319',"#D1665F")
Ecrire('',Light)
def aaaa(colora,colorf):
Light = Theme('#F1EDF5','#D1D2E8',"#EDD5EB",'#323133','#6F2EB0',"#C47ED6")
Ecrire('',Dark)
def strl(list):
list ="".join(list)
return list
pixel = tk.PhotoImage(width=1,height=1)
a =95
b =95
theme = 0
t = 0
ecrit = []
nombre_de_multdiv = 0
nombre_de_sous_add = 0
def Del(self):
global ecrit
del ecrit[-1]
affichage = strl(ecrit)
self.label1['text'] = affichage
self.label1.place(anchor = 'e',x = 450,y = 75)
def Del_all(self):
global ecrit
del ecrit[:]
affichage = strl(ecrit)
self.label1['text'] = affichage
self.label1.place(anchor = 'e',y = 75)
def Ecrire(symbole,self):
ecrit.append(symbole)
affichage = strl(ecrit)
self.label1['text'] = affichage
self.label1.place(anchor = 'e',y = 75)
def Ecrire_Resulat(valeur,self):
valeur = strl(valeur)
self.label1['text'] = valeur
def Calcul(self):
global nombre_de_multdiv
global nombre_de_sous_add
for i in range(len(ecrit)):
if ecrit[i] == '/' or ecrit[i] == '*':
nombre_de_multdiv +=1
for i in range(len(ecrit)):
if ecrit[i] == '+' or ecrit[i] == '-':
nombre_de_sous_add +=1
for i in range(nombre_de_multdiv):
for i in range(len(ecrit)):
if ecrit[i] == '*' or ecrit[i] == '/':
numero = i
nb = i
nbb = i
for i in range(len(ecrit)-numero-1):
if ecrit[i+1 + numero] != '/' and ecrit[i+1 + numero] != '*' and ecrit[i+1 + numero] != '+' and ecrit[i+1 + numero] != '-':
nb +=1
elif ecrit[i+1+numero] == '/' or ecrit[i+1+numero] == '*' or ecrit[i+1+numero] == '+' or ecrit[i+1+numero] == '-':
break
for i in range(numero):
i = -i
if ecrit[i-1+numero] != '/' and ecrit[i-1+numero] != '*' and ecrit[i-1+numero] != '+' and ecrit[i-1+numero] != '-':
nbb -=1
elif ecrit[i-1+numero] == '/' or ecrit[i-1+numero] == '*' or ecrit[i-1+numero] == '+' or ecrit[i-1+numero] == '-':
break
nombre1 = "".join(ecrit[numero+1:nb+1])
nombre1 = float(nombre1)
nombre2 = "".join(ecrit[nbb:numero])
nombre2 = float(nombre2)
if ecrit[numero] =='*':
resultat = nombre1 * nombre2
if resultat == int(resultat):
resultat = int(resultat)
resultat = list(str(round(resultat,5)))
else:
resultat = nombre2 / nombre1
if resultat == int(resultat):
resultat = int(resultat)
resultat = list(str(round(resultat,5)))
del ecrit[nbb:nb+1]
for i in range(len(resultat)):
ecrit.insert(nbb+i,resultat[i])
break
for i in range(nombre_de_sous_add):
for i in range(len(ecrit)):
if ecrit[i] == '+' or ecrit[i] == '-':
numero = i
nb = i
nbb = i
for i in range(len(ecrit)-numero-1):
if ecrit[i+1 + numero] != '/' and ecrit[i+1 + numero] != '*' and ecrit[i+1 + numero] != '+' and ecrit[i+1 + numero] != '-':
nb +=1
elif ecrit[i+1+numero] == '/' or ecrit[i+1+numero] == '*' or ecrit[i+1+numero] == '+' or ecrit[i+1+numero] == '-':
break
for i in range(numero):
i = -i
if ecrit[i-1+numero] != '/' and ecrit[i-1+numero] != '*' and ecrit[i-1+numero] != '+' and ecrit[i-1+numero] != '-':
nbb -=1
elif ecrit[i-1+numero] == '/' or ecrit[i-1+numero] == '*' or ecrit[i-1+numero] == '+' or ecrit[i-1+numero] == '-':
break
nombre1 = "".join(ecrit[numero+1:nb+1])
nombre1 = float(nombre1)
nombre2 = "".join(ecrit[nbb:numero])
nombre2 = float(nombre2)
if ecrit[numero] =='+':
resultat = nombre1 + nombre2
if resultat == int(resultat):
resultat = int(resultat)
resultat = list(str(round(resultat,5)))
else:
resultat = nombre2 - nombre1
if resultat == int(resultat):
resultat = int(resultat)
resultat = list(str(round(resultat,resultat[i])
break
Ecrire_Resulat(ecrit,self)
class Theme:
def move_window(self,event):
win.geometry('+{0}+{1}'.format(event.x_root - self.x,event.y_root - self.y))
def set_xy(self,event):
self.x=event.x_root - win.winfo_x()
self.y=event.y_root - win.winfo_y()
return self.x,self.y;
def boutontheme(self,colora,colorf):
self.openmenu(colora,colorf)
if self.t == 0:
Light = Theme('#F1EDF5',"#915ec4")
self.t = 1
Ecrire('',Light)
else:
Dark = Theme('#18181F',"#D1665F")
self.t = 0
Ecrire('',Dark)
def openmenu(self,colorf):
if self.ouvert == False:
self.b_theme.config(bg = colore)
if self.t == 0:
self.b_theme_dark = tk.Button(win,state=disABLED,text = 'Dark theme',font = font3,borderwidth=0,highlightthickness=0,compound="c",image = pixel,height = 20,width = 70,activebackground =colore,bg =colora,fg = colord,command = lambda: self.boutontheme(colora,colorf))
self.b_theme_light = tk.Button(win,state=norMAL,text = 'Light theme',colorf))
else:
self.b_theme_dark = tk.Button(win,colorf))
self.b_theme_dark.place(anchor = 'nw',x = 5,y = 25)
self.b_theme_light.place(anchor = 'nw',y = 45)
self.ouvert = True
return;
if self.ouvert == True:
self.b_theme.config(bg = colorb)
self.b_theme_dark.destroy()
self.b_theme_light.destroy()
self.ouvert = False
return;
def __init__(self,colorf):
if colora == '#18181F':
self.t = 0
else:
self.t = 1
self.ouvert = False
self.x = 0
self.y=0
#creation menu
self.canvas_menu = Canvas(win,width =500,height =25,bg = colora,highlightthickness=0)
# self.exit = Canvas(bg = colora,highlightthickness=0)
self.exit = Canvas(win,highlightthickness=0)
self.exit.create_oval(0,20,fill= colore,width = 0)
self.exit.create_text(10,10,text="x",fill = colord,font= font3)
# self.exit.bind("<Button-1>",lambda e: win.destroy())
self.exit.bind("<Button-1>",lambda e: root.destroy())
#affichage menu
self.exit.place(anchor = 'nw',x = 475,y = 2)
self.canvas_menu.grid(row = 0,column = 0,columnspan = 5)
#creation des canvas
self.canvas_screen = Canvas(win,height =100,bg =colorb,highlightthickness=0)
self.canvas_keyb_num = Canvas(win,width =300,height =400,highlightthickness=0)
self.canvas_keyb_op = Canvas(win,width =200,highlightthickness=0)
#affchage des canvas
self.canvas_screen.grid(row = 1,columnspan = 5)
self.canvas_keyb_num.grid(row = 2,columnspan = 3,rowspan = 4)
self.canvas_keyb_op.grid(row = 2,column = 3,columnspan = 2,rowspan = 4)
# creation des boutons
self.b1 = Button(win,text ='1',activebackground =colorc,foreground=colord,height = a,width = b,font = font1,command=lambda: Ecrire('1',self))
self.b2 = Button(win,text ='2',command=lambda: Ecrire('2',self))
self.b3 = Button(win,text ='3',command=lambda: Ecrire('3',self))
self.b4 = Button(win,text ='4',command=lambda: Ecrire('4',self))
self.b5 = Button(win,text ='5',command=lambda: Ecrire('5',self))
self.b6 = Button(win,text ='6',command=lambda: Ecrire('6',self))
self.b7 = Button(win,text ='7',command=lambda: Ecrire('7',self))
self.b8 = Button(win,text ='8',command=lambda: Ecrire('8',self))
self.b9 = Button(win,text ='9',command=lambda: Ecrire('9',self))
self.b_point = Button(win,text ='.',command=lambda: Ecrire('.',self))
self.b0 = Button(win,text ='0',command=lambda: Ecrire('0',self))
self.b_plus = Button(win,text ='+',command=lambda: Ecrire('+',self))
self.b_moins = Button(win,text ='-',command=lambda: Ecrire('-',self))
self.b_fois = Button(win,text ='*',command=lambda: Ecrire('*',self))
self.b_diviser = Button(win,text ='/',command=lambda: Ecrire('/',self))
self.b_del = Button(win,text ='DEL',command=lambda: Del(self))
self.b_del_all = Button(win,text ='CE',command=lambda: Del_all(self))
self.b_egale = Button(win,text ='=',bg = colore,activebackground =colorf,width = 295,command= lambda: Calcul(self))
#affichage des nombres
#colone 1
self.b7.grid(column = 0,row = 2)
self.b4.grid(column = 0,row = 3)
self.b1.grid(column = 0,row = 4)
self.b_point.grid(column = 0,row = 5)
#colone 2
self.b8.grid(column = 1,row = 2)
self.b5.grid(column = 1,row = 3)
self.b2.grid(column = 1,row = 4)
self.b0.grid(column = 1,row = 5)
#colone 3
self.b9.grid(column = 2,row = 2)
self.b6.grid(column = 2,row = 3)
self.b3.grid(column = 2,row = 4)
#operateurs
self.b_plus.grid(column = 3,row = 2)
self.b_moins.grid(column = 4,row = 2)
self.b_fois.grid(column = 3,row = 3)
self.b_diviser.grid(column = 4,row = 3)
self.b_del.grid(column = 3,row = 4)
self.b_del_all.grid(column = 4,row = 4)
self.b_egale.grid(column = 2,row = 5,columnspan = 3)
#ecriture
self.label1 = tk.Label(win,text = '',justify = tk.RIGHT,font = font2,fg = colord)
self.label1.place(anchor = 'e',y = 75)
self.b_theme = tk.Button(win,text = 'Themes',width = 50,command= lambda: self.openmenu(colora,colorf))
self.b_theme.place(anchor = 'nw',y = 2)
self.canvas_menu.bind('<1>',self.set_xy)
self.canvas_menu.bind('<B1-Motion>',self.move_window)
if theme == 0:
Dark = Theme('#18181F',"#D1665F")
else:
Light = Theme('#F1EDF5',"#915ec4")
#win.title('calculator')
win.master.title('Calculator')
#win.resizable(height=False,width=False) # Not needed with overrideredirect.
win.mainloop()
我将每周生成这些报告，所以一周我们可能有用户 2 的图像，而一周我们可能没有用户 2 的图像。所以我知道我可以编织并运行 html 并设置错误 =真的。但这仍然会在缺少图像的 html 输出中显示错误消息。有没有办法设置一个条件，如果文件不存在，该块将不会在我读入文件的地方运行？我使用magick包从参数中指定的路径中读取每个图像。
解决方法
您也可以将 R 语句传递给 knitr 选项，如下所示。
---
title: "test conditional chunks"
output: html_document
params:
user1: "C:/Users/blah/Desktop/Discrete-event-simulation-concepts.png"
user2: "C:/Users/blah/Desktop/Discrete-event-simulation-concepts5.png"
---
```{r setup,include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
```{r condition 1,echo=FALSE,eval=file.exists(params$user1)}
# plot image
```
```{r condition 1,eval=file.exists(params$user2)}
# plot image
```
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